Poor little mama ham and well done you for taking them on.
Is she staying with them as her behavior looks stressed in the film? Our mums never come off the nest except for food and toilet at this age normally.
The house is way too small for a growing litter. Should she move they out that house into an open nest I would very quickly remove that house and leave her with just a pile of that tissue bedding you have. They will outgrow it in a few days. They grow very fast. Give her as much privacy, peace and quiet as you can and be sure not to touch the babies or the nest.
If the other mum has a house take it out before she delivers in it!
Welcome to the forum and good luck with the babies.
Read this and you will find all you need to know about caring for them.
Hamster Forum