maybe you get a playyard or play pen. When yr baby is awake, yr mom can leave her in it.
If baby doesn't want to bottle-feed, some mummies say try different bottles & teats until you get the right one. Some try different mix of breast milk & FM.
You have not't gone back to work yet. Maybe milk-feed problem will be resolved by then. dont't worry so much. If she really wakes up many times, then complain to your mom. Otherwise, you may have quarrelled for nothing.
So far, yr mom seems pretty normal. dont't think your mother can or would want to make your baby sleep all day. After 4-5 month, babies start to flip & sit up longer. No self-respecting baby will want to lie down anymore. Mine just enjoyed watching us do things as she sat or laid on the bed.
Infant care is so-so only. Babies fall sick easily. They thrive on individual attention. Even the faster babies learn to walk at 9 month or so. Before that, infant care can't do that much. MCYS mandates 1 adult :5 infants. If you r worried about no stimulation, discuss a routine w yr mum. Try out the time-table/routine before you go back to work.
I didn't expect my mum or helper to know about infant development or stimulation. I got some stuff ready or just allowed my baby to explore on her own.
Childcare for toddlers is quite good cos most grandparents can't do school stuff like reading, craft, waterplay, etc