Am confused, please help.?

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I have been friends with a female coworker for about three years now. We both work in a customer focus business. We fell out last year and I was blocked on FB. We were lending each other stuff at the time.
Since the falling out we still lend each other things, we still talk but at times I feel the talking is a little forced. When I say morning to her she shows no emotion. when she says hello to everyone else she smiles. When we talk she rarly uses eye contact and carries on working. Where else with everyone else she stops to talk. This was the same as before. I asked her if she wanted to be friends on FB again in a letter and had no reply.
My question is how can I tell if I am friends with her still, is there a way I can check without it seeming werid? My theory is if I am still blocked then the oringal problem must still exist?