Are they tight enough around your daughter's legs? I know I had a problem with that on my son when he was really little. Sizing can vary with FBs since they are handsewn. Also, how long are you leaving them on her at a time? My son is a heavy wetter, so I cannot leave them on as long as I could a disposable. I often check the insert at the back to see how wet it is. That is the easiest way to check to see if he needs to be changed or not.
To check for repelling, try wetting the diaper with water. If the water gets absorbed through the diaper into the insert with the inner part of the diaper feeling only slightly damp, then the diapers are working fine. It may just be a matter of fit then. If the water does not get absorbed through to the insert, then they are repelling. Repelling usually happens due to a buildup of soap. I have not heard of FBs repelling right after being bought.
I use Arm and Hammer Free and Clear which is listed as a safe detergent on the FB web site (http://www.fuzzibunz.com/faq.php#q23). It is much more affordable than many of the recommended detergents.