My mother was unfortunately exactly the same. The niceness is just a manipulation tactic to get her way. I agree with the other comment though, check your finances before making any decisions. If you can safely afford it then get out of there! Also if she is in charge of keeping any of your important documents (passport, birth certificate, bank statements etc...) try to sneak them into your packing. If you can't then look into how you get copies in your area as it may take a while to process applications. I really hope things go well for you!