We used the comfort formulas with both my babies for a while. We used Cow and Gate for DS and the Aptamil Easy digest for DD, of the two I actually preferred the Aptamil one. They both turned their poo a dark green colour - the Aptamil one contains a stool softener, not sure about the cow & gate one.
If you think she has reflux it would be worth getting it checked out properly (if you haven't already), especially if she is in pain or discomfort. My two were both refluxers and did ok on the ED formula for a while but needed a reflux formula and meds. We used Enfamil AR which is suitable from birth which you need to order from a pharmacy (and is available on prescription in the UK
) but I think Aptamil do a reflux formula you can get in the supermarkets now. SMA also do one so Cow and Gate may well do now as well!
Laura