New relationship She has 9yr old Girl who treats mum like
I have been in a new relationship for about 5 months now and things are going well But I have concerns about how her 9 year old daughter is talking to her , she is extremely rude and cannot answer a question with out sarcasm and or shouting , at first I thought it might be her way of trying to compete with me for her mothers time but now we have been seeing each other for a little while a pattern is starting to develop , the mother has custody but the little lady goes and spends every second weekend at her fathers , when she comes back it's like she has changed into some kind of monster and it takes a couple of days for her to settle down again , I just don't feel like I have earned the right yet to express my thoughts to her mother , I am mindful that I will never take her fathers place but believe I can give her a good home , now to my questions ,
1: do I have any avenues open to me to be able to express my disappointment to the little lady without it turning into a confrontation.
2: is this normal behavior for a 9 yr old girl .
3: if I lay the law down so to speak how will that effect my relationship with the little lady & also her mother.