My tourist visa expires today and im on 90th day already (extended it 30 already) , can I go.to chaeng wattana and extend it 7 days for 1900 baht? Or if they refuse it they will give me 7 anyway?

I still have to wait a few more days for my non imm documents ...

You can apply for a 7 day extension, pay the 1900 baht fee and be given 7 days to leave. They do it all the time.

my filipino gf had a 90 day tourist visa with single entry which she has been back in philippines since November. Can she come back on the 30 day tourist visa or does she need to re-apply for 90 day visa?

my filipino gf had a 90 day tourist visa with single entry which she has been back in philippines since November. Can she come back on the 30 day tourist visa or does she need to re-apply for 90 day visa?

She can get a 30 day visa exempt entry without a problem.

If she plans on staying longer than 30 days she should get another tourist visa.