No wee corner??

[peridotgreen]

Hi all so my sister has a Syrian and I’m after abit of advice, she had this hamster for about 5 months now, and she’s started to slowly burrow, however recently my sister can’t seem to find where her hamster goes to the toilet, she’s checked all corner and inside where she sleeps.
Prior to her burrowing she had a wee corner, is this anything to be concerned about? My sister said she is still drinking etc

Any help appreciated