I'd probably hold off on having her buy anything until you are ready to visit. You may want your daughter confined until 3 but she may start escaping before then. DD started climbing out of the PNP at 19 months, then soon after the crib. If you're nervous about the stairs then take a baby gate or shut the door to the room she is sleeping in.
This was us with DD1 - She started crib diving at 18 months old, so we had no choice but take her out of her crib.
My mom has a spare mattress she lays on the floor for DD1 when we visit, and DD2 sleeps in a bassinet my mom got from a friend. My mom got a baby gate since the bedrooms are all upstairs.