Pontine stroke recovery

As suspected my mum (68F) had a stroke and they have said it was a right hemi pontine stroke. This has resulted in left side paralysis on Friday. Within one day after the paralysis, she was able to get some movement in her left hand and lift her left knee when in bed. This morning, one day later, she has lost all that movement again and completely no movement again. Is this setback common in recovery or do we need to be aware of something else? She’s in hospital being treated with a barrage of medication, but it’s awful to see this setback and was positive after her first improvements. Any advice or personal experience would be greatly appreciated.