What I was trying to say is that really sloppy pooh and frequent chucking can just be normal - and if your baby is growing and active and mostly happy then there is no need to do anything at all other than take lots of spare clothes and a towel with you. It should get better as she grows.
Talking to the ABA and having her weighed should give you a bit more of an idea as to whether you have an actual problem or just a messy baby.