to be the bearer of bad news i doubt that by weaning or night weaning will change your nocturnal bub. you have only been back for a short period of time so she is getting used to the only "quality" time with you is at night. so until she adjusts to seeing you from 4 ish til bed time she may wake to be sure mum is still around and to have some extra comfort.

do you co sleep? i found when my DD was going through this that I/she slept better when she slept with me and had free access as i would go to sleep as soon as she was attached.