step momma I have a custody question

Katey • I`m 23 pregnant with my second

so 2 of my 3 step kids didnt want to go for visits my husband and I encouraged them to go even made them go out and talk to their mom . there mom talked to them for s minute or 2 then let them come back inside my house . shes now saying the called her lawyer and we aren't gonna get away with this . did we do anything wrong ? what else could we have done short of locking them out of the house ?