Hello youngmoneymilli,
Thank you for reaching out to Apple Support Communities.
It sounds like she connected to your hotspot. She will not have access to your data. This should help:
"How to set up a Personal Hotspot on your iPhone or iPad
A Personal Hotspot lets you share the cellular data connection of your iPhone or iPad (Wi-Fi + Cellular) when you don't have access to a Wi-Fi network.
Set up Personal Hotspot
- Go to Settings > Cellular > Personal Hotspot or Settings > Personal Hotspot.
- Tap the slider next to Allow Others to Join.
If you don't see the option for Personal Hotspot, contact your carrier to make sure that you can use Personal Hotspot with your plan."
Additional details can be found here: How to set up a Personal Hotspot on your iPhone or iPad
Hopefully this helps.
Cheers!