How do you find your birth mother?

[Possum]

Totally depends on where she was born.

Australia - all records are open once you become an adult.
USA - sadly most states have blocked all access to that info.

Here's some places to start -

First - add your details to the registries here -
http://www.isrr.net/
http://registry.adoption.com/
(also look for local state and country registries – beware of those that ask for money)

Check for searching information here -
http://www.bastards.org/library/search.htm

Check here for search help - and links to search angels -
http://www.adoptioncrossroads.org/

And check here for any support - it's the best online forum for adoptees I've found -
http://www.adultadoptees.org/

All the very best with the search. Do let your mum take the steps - as it needs to be her search first and foremost. It's wonderful that you're supporting her - as she'll need all the support around her she can get.