Daughter is always poorly

[Hithereeveryone]

Hi my daughter became quiet unwell a few years ago and have very low blood sugar, we alwere in hospital and they ran tests, they said she had a virus and that is what caused it, I have kept an eye on her blood sugars every now and then with a home glucose monitor,She suffers with tummy ache alot, I took her reading this morning and it was 6.1 mmol/l FBG is this normal for a 9 year old girl who hasn't been diagnosed with diabetes?

TIA