Aylie, am no doc, so can't really 'advise' you. I can only share with you on what I know, base on my own experiences and what I've heard from others.
However, I wld think that if she's not showing signs of wanting/needing more after her usual portion's finished, you shldn't increase the portion. 'Cos afterall, their stomach is just that small size only. Unless she cries for more, then you shld increase. That's my opinion.
I used to be very worried like you during my #1's time. She started to reject milk(from more than 100ml ea feed, down to only abt 20-30ml), and I resorted to dream-feeding her, only for her to regurgitate them out... I've not heard her cry for milk since, [IMG=http://www.singaporemotherhood.com/forumboard/clipart/sad.gif]. The numerous trips to her PD resulted only to constant medication to try clear her phlegm and in the end, I have no choice but to give TCM a shot. The physician told me that her stomach's bloated with phlegm and thus she's losing apetite and regurgitating - true enough, we noted sticky phlegm in her throw-ups. Soon, this problem resides with the TCM and her apetite resumes. Regret wasted sooo much time and $ gg to her PD on this issue.
I've also tried massaging too, but I didn't bring her to the yu guo though, 'cos many of whom I knw, brought their bbs there and found it not effective. So I've gone for a baby massage class myself, one that's organised by Gleneagles(Parkway hosp group, 'cos Mt E, didn't have such classes then). It helped and the time I spent massaging her was really great, [IMG=http://www.singaporemotherhood.com/forumboard/clipart/happy.gif]
However, this was my child's case and I'm not sure if your baby's of the same scenario. If she's not 'heaty' or whatever, perhaps, then it might be like what u're saying - teething, which can cause discomfort enough for them to reject feed at times. At least she's taking cereal! Although it's been a week already since her fall, if u don't feel safe, u might wanna check with her PD on this...