B.B.
Just a bunch of random thoughts...
There are many possibilities as to why she is "needing" you and some of it probibly has to do with the fact that all of a sudden your attention has to be split with another person... Even if it wern't her daddy, she would probibly get clingy if someone else dropped in for weekends.
I would say to have a discussion with hubby. So he knows what to prepare for. Arrange a weekend/ couple days trip for YOU/ or them!!! You keep the baby to make it easier on him... SHe may not realize that daddy can take just as good care of her as you can. ... Then she has noone to lean on BUT HIM... And it gives them bonding time... Don't know what they would do, but they should do it TOGETHER... No mommy interference. ANd don't call to talk to her every night.
Or it could just be HER. My 6 yr old although she loves her daddy, will chose me helping her over him. Always has... My 6yr DD and 3 yr DS still fight over who's gonna sit by ME on the sofa. No body worries about where daddys sitting, but who gets to sit by MOMMY. You are her support system during the week. She may feel that he's "taking you away" from her for some reason or other.
When he is there plan out 30 min or so that its just you and her time. Make it story time. Hubby wrangles baby... You and her. I know on weekends I try to soak up as much hubby time as I can get, and he's here thru the week... It could be that she's just feeling left out...