Dear Julie,
That is really sweet of you
I am sorry I cannot help with regards to what you should be looking for with your mum.
Your red flag moment for the plum jelly is surely a sign for you that your mum is not feeling her usual self. Especially after probably plucking many of the plums off the trees herself.
I really hope that she is just tired and her energy levels are low. I know when I had an appointment coming up with oncology I would nose dive into worrying about the unknown.
The CT scan sounds like a good idea and the best way to approach it with your mum is by explaning your own reasons you would like her to have them done. Your mum is one strong willed lady and will make up her own decision for the way forward.
Wishing your mum all the very best for the next appointment.
Those wild red plums sound scrumptious and yes I would love a jar of that yummy jelly.
Happy jelly making...
Leigh