What are fun things to do at a sleepover with 2 teenage girls?

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The Ouija board is perfectly safe. Play and have fun. People who think it's "dangerous" are uneducated and believe in the supernatural, which doesn't exist. What is dangerous is "chubby bunny" or that idiotic "salt and ice challenge" or "cinnamon challenge":

Chubby Bunny has caused at least two deaths, both from suffocation due to the throat being blocked with marshmallows:

On June 4, 1999, 12-year-old Catherine "Casey" Fish died after choking on four marshmallows while playing Chubby Bunny. The contest was scheduled for the annual Care Fair held at Hoffman Elementary School in Chicago's North Shore area. It was to be supervised, but Casey and some of her friends began playing while the teacher was momentarily away. She collapsed, and was taken to Glenbrook Hospital, where she died a few hours later. Fish's parents subsequently sued the school district and appeared on Oprah to warn about the dangers of Chubby Bunny.

On September 12, 2006, Janet Rudd, 32, from London, Ontario, Canada died in a Chubby Bunny competition at the Western Fair. St John Ambulance volunteers came to Rudd's aid with a defibrillator and suction equipment, but were unable to remove the blockage in the unconscious woman's throat.
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Ice and Salt Challenge:

(CBS News) A 12-year-old Pittsburgh boy is recovering from serious burns after partaking in the "ice and salt challenge."
CBS Pittsburgh reported the boy was challenged in in the dubious task in which kids aim to show off their pain threshold by wetting an area of skin then covering it with table salt, before applying pressure with an ice cube until the pain becomes so unbearable they stop.

The challenge is so painful because of the chemical processes involved. Typically water freezes at 32 degrees Fahrenheit, but adding salt causes the freezing point to drop as low as 0 degrees. When applying ice, energy is pulled from what's nearby - in this case, heat from a kid's skin. While "competitors" fight the urge to drop the ice, they risk further damage in the form of blisters or second-degree burns, or frostbite.

Within a few hours of the boy's injury, the skin appeared red and by 48 hours, his back developed blistering second-degree burns which will heal over the next several weeks, doctors said. He was treated with skin antibiotics and medication to control pain.

"There are risks. You could end up having surgery or a scar for the rest of your life," Dr. Ariel Aballay, a burn specialist at West Penn Hospital told CBS Pittsburgh, as he pointed to pictures of the boy's cross-shaped burn. "If something is causing a lot of pain, probably not a good idea to do it."

The boy's parents said in a hospital -released statement that they hope sharing their son's story will stop others from participating in the challenge.

"Videos on You Tube, Facebook and other social media do not accurately show the terrible injuries that can result," the unidentified boy's parents said. "We are grateful that our son is recovering and hope that sharing his story will stop other young people from attempting this stunt."
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Cinnamon Challenge:

The stunt can be dangerous and even life-threatening. There is a risk of gagging on the cinnamon, especially if it forms a clump and clogs one's airways. Accidental inhalation of cinnamon can seriously damage the lungs by causing inflammation and leading to infection. Furthermore, due to the moderately toxic chemical compound coumarin present in cinnamon, European health agencies have warned against consuming it in large amounts. The usual result of this stunt is "a coughing, gagging fit involving clouds of cinnamon" which "leaves some people gasping for air". Sometimes those performing the stunt may gag and accidentally exhale the cinnamon through their noses. This often results in considerable irritation, discomfort, burning, or itching of the affected nasal tissue and nostrils. On YouTube, those afflicted with discomfort from nasal exhaling of cinnamon have been observed irrigating their noses or wiping their nostrils vigorously in an effort to relieve the irritation.Vomiting is also a possibility. However, the risks can be worse: a high-school student in Michigan spent four days in a hospital with an infection and a collapsed right lung after attempting the cinnamon challenge.