Rainbows and faith

I realise that I've become somewhat obsessed with checking Maeve's temperature and it is pretty unhealthy. My little one is so irritated by my constant feeling of her forehead and using 3 different thermomters to check her every half hour! Her temperature today is 37.4, which explains my nerves. Although she is on GCSF which should raise her counts and hopefully prevent a fever, I am still paranoid. Last night, she had a bad night with bad dreams so kept tossing and turning. I interpreted it as pain, fever, discomfort and kept asking her if she was alright, which of course disturbed her and woke her up!

My little girl keeps reminding me that God is in control and she will NOT get a fever and that He sent her a rainbow on Tuesday as a promise. The problem is, I find it so hard to just have that faith and trust God the way she does. I also don't know how to explain to her that God also can choose to use doctors and medicine to heal her and make her well, which explains the battle we're having wit regards to her daily GCSF injections.

" i don't need it! God will make me well!"
"yes honey, but God wants to protect you WITH injections"
"He won't do that. He will protect me WITHOUT injections"
And so on...every hour.
I guess I'm asking the same questions as her. Why can't God just protect her without injections? or better, why can't God just heal her without chemo, which comes with a whole lot of side effects, which she gets?

I only hope that her faith doesn't waver (or mine for that matter) when God doesn't seem to be answering her prayers. The one thing that I rejoice in is that although her counts are even much lower now than it was when she had a fever the last time, she doesn't seem sick at all, not like the last session of chemo. So i guess God is sustaining her supernaturally, even though the results on paper shows she should be neutropaenic.And this small miracle is something I remind myself of. So now for courage as she faces her next injection, which is thankfully done by someone she likes.