mini-stroke 5 days ago and getting worse

My mother was diagnosed as having a TIA (mini-stroke) 5 days ago. Today (while in the hospital) she seems worse than when she went in. What would cause this? The MRI completed yesterday showed no changes, but she is having more trouble understanding, speaking, and walking. Is this because of lack of rehab or did she possibly have another stroke and they just haven't figured it out yet? I am worried sick. She just got out of the hospital 2 mo. ago; she was in for 3 weeks with electrolyte disorders and nearly died. She has been on cortef for joint pain at home, and I can't seem to be able to get word to the DR. to give the order for it there.