Hello and welcome!
Bats cannot bite a human without first landing on them...so your mother would KNOW if she'd been bit.
Transmission of rabies from an animal to human is virtually exclusive to a bite, so you really have nothing to worry about
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I hope that you can use some Positive Mantras/Reassuring Statements to help rid yourself of this worrisome thought.
Please see our Resources if you need some good self help material for anxiety managment...and post with us anytime for support!
Be well,
Scaredy Cat