My 10 year old daughter has this friend great little girl she spends the night all the time but her…

My 10 year old daughter has this friend great little girl she spends the night all the time but her mom and I have never talked lol she doesn’t both to check on her kid and at one point I had her for over a week! Well.. her daughter messaged me on her moms fb asking if she could come over I said np cause we love having her over, shortly after I told her I was On my way! Her mom messaged me asking for 20$ and she would give it back that day around 2:30... (I gave it to her) many excuses later and 3 days pass I see her on fb going to the movies and her and her bf going out to eat, I finally just messaged her and told her to keep the money. With no thank you or anything she asks if I know where her daughter was!!?? I told her she’s been with me she said she was asleep the last time she talked to her daughter and doesn’t remember what she told her mom, should I be concerned???? This little girl never seems to want to go home and I could never leave my kid with someone idk for that long. The only time she’s talked to me was dealing with the 20$ situation.. or am I over reacting??