My question involves criminal law for the state of: PA

Due to her probation violation a friend of mine was just sentenced to 1 year with a max of 23 months house arrest (with ankle monitor) with 1 year probation. But there seems to be an issue with getting homes/apartments approved to serve her house arrest. Due to the landlord's refusal or it being public housing. My question is where will she be serving out her sentence if family residence it not approved? Would she remain in jail?