Do you believe prayers matter? Should I pray for my friends health?

I am not a religious person I believe in God but I’m not really into any organized religion.

I recently found out a friend with health problems has more issues recently.
I know her from online interactions and I never met her in real life.
She has auto immune issues, has issues walking lately and has something weird show up on an MRI scan.

I truly wish for her health to improve but since I don’t have that power I wonder if prayer would mean anything.
Do you believe prayers matter? Should I pray for my friends health?
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