Neighbors intruding kid

So we live in an apartment complex, and have a lot of neighbors.The issue is, that one girl has taken quite a liking to our 2 year old son. She is much older than he is, but not by huge amount. She's probably about the age of starting school. 5-7.She first included herself around my son when he was out with his dad. Which is ok, but lets note that she speaks a different language, which is my first language but not my husbands.She's pretty nice and all, but there is behaviors which I find questionable. Mainly these:She followed my husband home.She started to knock on the door several times a day. To ask them to go play with her outside.Then she started to ring the bell.After this she for the first time yesterday put her arm in between the door.My husband didn't stop her from coming in, because of her excuse of " I don't want to wait out here it's boring". It's a lobby so not unsafe.After this she has started to ask to play indoors. I say no multiple times and explain why not. She keep saying " Just for a minute".She kinda low key keeps eye on our balcony and car.​Other contributing factors:Her mom seems to not to care what so ever where she is and with who. The girl is outside talking to strangers all day long.It doesn't appear as if she is doing this to truly play with our son, rather to play with my husband. They play tag and such, which my son likes to watch. But every now and then my son seems a little left out.She's bossy like all kids her age I assume.She doesn't listen to what I say. My husband doesn't notice due the language barrier.This is visible by:I told her to not jump from the swing. ( If I'm looking after her, I do not want injuries). She rationalized " I always do this."I told her to not to pick up my son and toss him around carelessly. She murmured something about it not mattering, but stopped at least.I told her to not touch my cats, which she completely ignored and touched them anyways.Actions I have considered to take:I am intending to tell her to not to come to our house again, but I'm afraid it's something my husband should do since he's the one who allowed it to go this far? I don't think it will help to talk to her mom, she simply doesn't seem to care. Like, there is a railroad and a lake right next to the building. It's not a bad neighborhood, but not brilliant either. Worst that has happened was some lady walking around with an axe at 1 am.​Finally:So, are my concerns reasonable? I don't have issues with her playing with my son outside, but all this other stuff is a big no from me. I don't open the door when she knocks or anything, I have made it clear this is something my husband will have to deal with since he allowed her to come all the way in. Most of this stuff is happening semi daily.I'll be offline for most of today, so it might take a while to respond. Any thoughts on how concerning this is are appreciated, as I tend to be an anxious person and there is a chance I'm over reacting. via /r/Parenting https://ift.tt/2S1MJro