[cypher]

Provided the room is a reasonable temperature & she has lots of substrate & nesting material she should be warm enough, they do sometimes sleep more when it's colder & burring themselves quite deep down in the substrate is normal too so I wouldn't worry too much but do continue to keep an aye on her to be sure she's eating, drinking ok & no showing any signs of illness.
Young hams are usually very active but she may be more active at night than you realise & they can change their routine a bit sometimes, if she's still settling in she may have got over the initial excitement of exploring her new home & be adjusting to things a bit, so just see how she goes.