Need advice! We don't know what to do!

We are new to FP. We were shocked at the state the girls(2) were in when dropped off from another FP. We live in snow country, she dropped the baby off with only 2 pairs of pants & shirts. All the clothes for both girls where dirty & urine soaked. No hair brush, tooth paste that was covered in animal hair. Told me not to feed the girls carbs, to limit their food intake because they were food hoarders & purgers... And the 2 year old out weighs her 4 yr old by almost 6 lbs.(2 yr old weighs 36lbs)Um they are 1 & 2!!! Mind you foster mom weighs about 98lbs soaking wet! So it was very obvious that FM has food issues she's transferring/projecting on all children in the home. I notified our agency worker of the conditions & let her know we have not observed any of the behaviors she said they demonstraight on an hourly basis everyday. The agency worker stated they have been concerned with this particular family & placement. So long story short. The CPS caseworker, supervisor & foster agency worker all agreed the girls where thriving in our home & asked if we'd like to foster them we said sure. Their great girls who need lots of love & attention and we can give that too them. It's the 2 yr olds 3rd time in the system! So theres a high likely hood for adoption. Well during the time we had the girls they got sick, so it wasn't all rainbows & unicorns! They waited to tell the previous foster mom of the re-homing till she got back into town. Well she didn't take it to well! She started calling us & accusing us of stealing her girls and that it was so unfair! She apparently called in a favor to her friend who works for CPS and pressured the case worker & supervisor to reverse their decision. Well case worker wouldn't, so she was removed from the case & the supervisor caved and reversed the placement! Ugh!!! Really is it possible to do what's in the girls best interests! So the foster agency worker came & got the girls. She said she felt really bad & was really unhappy with what was happening. She drove the girls away & you could hear the 2yr old crying for daddy(my hubby). She said during the custody exchange the girls acted like they didn't even know who the foster mom was... By far her weirdest exchange to date & she's been doing this for 15yrs. So we're just so upset that they didn't do what was in the best interest of the girls, and let a FM dictate placement! She has 3 bio kids & a foster baby that is a year & half with severe uncontrolled asthma(who has numerous treatments, hospilization & medical apt's)So there's 4 kids under 2.5 and all 6 are under 6.5...plus she does regular babysitting! I think she's just overwhelmed. But she's unwilling to do what's best for the girls. We've been told BM is in jail & likely to loose custody of all 5 of her kids and the state adoption coordinator has already refused adoption placement to this foster family. But we are very fearful she is causing a great deal of trauma to the girls that is unnecessary. What if any recourse do we have? We fell in love with these little girls and want what's best for them! Any advice would be greatly appreciated!