Not sure HB, it could be, but there are also several nasty tummy bugs going about. My son's GF has been I'll with one of them & youngest granddaughter has been hit with second bug in 3 weeks.
C Diff or bug, rules the same. Clean hands with soap & water. Be extra careful with your mum. You can't watch her all the time. Wash, wash, wash. Make sure her loo is disinfected, towels boiled. I expect you know all this having done food hygiene.