Very sorry to hear that, man. Hope she feels better soon.
I'm not a medical professional, nor am I speaking on behalf on Biotest... but...
Fish oil can act as a blood thinner. If she's on medications for blood pressure or prescription blood thinners, this could certainly cause a problem.
Also, the Piperine in Curcumin 500 can "enhance" the effects of some medications. Again, if she's taking any prescriptions, it could cause problems comparable to taking a higher dose of those medications.
Bottom-line, it's remarkably admirable that you want to do anything you can to help your gram. My gram is 94 and I still get asked nutrition questions for her, so I can definitely relate. However, at that age, it's so important to be conservative with any supplement or any nutrition changes at all.
I look at it kinda like, the lady (my gram and yours) made it nine decades and counting, so obviously she's been doing something right. We need to basically try not to interfere with what we think might be "a better way." Ya know?