Who goes where the morning of the wedding?

Here's the situation:

One of my BMs (who is the mother of a FG) wants to know what time we'd like her in Brooklyn the morning of the wedding (she wont be getting her hair or makeup done with us). So I have two questions:

1) What time do I tell her? Wedding is at 1pm and we live 2 minutes from the church so traffic isn't an issue. Noon? 11:30? I'm also thinking that it would be better if her daughter wasn't just sitting around doing nothing for too long (she's only 5) so the later the better.

2) Where does she go? Where I will be or to FH? She is FH's cousin and the FG is his goddaughter. Similarly, my brother is one of the groomsmen. Does he go to FH before the church or does he stay with me? I kind of like the idea of my brother being with the rest of the family and then just meeting up with FH at the church, and this BM and the FG be with FH. What do you think?

TIA!!!

Same thing happened with me and two of my BM's who were both mothers of two of my Fg's. they were both FH's sisters.
I told them to come over about ½ before we were ready to go so the kids wouldn't be running amok and they still had time to take pics with me and they met at my home. then we all went to the church together.
My BIL was a BM and he met my DH at his home and then they all drove to the church together

1. I think you should tell her 1 hour before the wedding, just in case shes late, traffic, etc. 1 hour isnt too long for a 5 year old to sit around.

2. I think girls with girls, and guys with guys, regardless of who is related to who. I have FH's sister with me that whole morning, and we barely ever speak. And FH has my brother with him that morning.