glad you have spoken to hv and are feeling happier about it.
if it helps any my dd did this LOTS, she never ever took more than 25oz a day and that was right up until 6mths when we she was weaned, we tried allsorts, different teats, no distractions, with distractions, trying to feed her when asleep etc.
feeding her standing up worked for a while and also to feed her sat in her carseat!
now at 8mths she generally has 16oz ish aday and thats with her having some in her food! but this week she has had 20oz a day, for some reason taking more at each feed, but she has NEVER had more than 5-6oz at a feed.
she has continued to grow fine and is thriving, she loves her solid food, always offer her milk first and i top up her dairy with yog, cheese etc.
she is the complete opposite to my boys who were all big milk lovers, so it really baffled me and stressed me out, i took her to the drs a few times to check for sore throat/ears etc but there was never any reason, maybe teething and recenlty she had a bit of thrush, but that didnt seem to affect her milk intake.
remember all babies are different and try and look at what she has over a week, as long as she has plenty of wet nappies, is pooing, happy and alert she will be getting what she needs :)