Second sickness bug in 8 weeks?!

[Pippa92]

My DD (7) had a bad sickness bug 8 weeks ago, it took her a good few days to get over it. Now, 8 weeks later, she's spewing again! She doesn't seem as bad so far, so fingers crossed she recovers quicker this time.
She had tonsillitis a couple of weeks ago, followed by a bad cough/cold. I honestly feel like she's been constantly ill with something lately - it's getting very tiring for her!
Anybody else have kids with rubbish immune systems at the moment?! Or any tips on how to boost the immune system?

Here!
dd6 had bad tonsillitis in November, hospitalised with norovirus it was so severe in December, then caught strep A scarlet fever before Xmas, has had a cough for 3 weeks and a new cold started today.
she’s on a probiotic yogurt drink + a multivitamin and she still gets Everything. I’m exhausted and fed up worrying about what is going on with her immune system, Gp isn’t worried but it feels endless. All my fellow mama bear love 💞