Assuming she earns miles for that flight. Her UA roundtrip flight miles would be ~5K UA
That would bring the cost of 30K UR down to around 25K UR if considering 1 UR = 1 UA.
The price would be the same for transferring to BA and book on AA award ticket. Maybe lower fees on AA. However, I still would not use UR points for this short route unless I absolutely have to.