J.B.
Hey J.~
My older boy did a similar thing... he was 11mos, though. He decided he liked the sippy cup better than the bottle. I just gave him formula in the sippy instead. It made it super easy - no struggle with taking the bottle away at 3 years old or something! ;)
As far as the spitting up, that may have just been a fluke... she should be getting finger food at this point... is she taking anything solid or baby food? She may just be ready to give up on the bottle. In which case, try the formula in the sippy thing. It worked for me.
Good luck.
~J.