My mother no longer knows what we mean when we ask her to take her pills. She no longer seems to process directions well at all, most days. (Some days, she *does* understand, of course, but many days she does not.)
The one caregiver can sort of badger her into taking her meds. The other puts them on her food, not attempting to hide them.
I have found that she loves it when I myself approach her with her meds. I hand her a glass of juice, iced tea, or water, and cheerily say that it's time to take her medications. One by one, I pop the pills into her mouth, motion for her to take a swig, and down the pills go. She seems to love the special attention.
The caregivers are not permitted to do it this way with her (they are not legally permitted to "give" her her pills, just to supply them to her), so this won't work for them, over here. I think if you could, you might go and see your mother during med-giving time and see if this might work for you. Making a special, happy, loving thing out of it has worked for us here. My mother lives with us, and I am her caregiver when the hired ones are not here, so this is becoming routine for us.