Calls going straight to voicemail in iPhone 12 mini

Open her contact card in Contacts and see if you inadvertently blocked her.

Beyond that, see→Why doesn’t my phone ring? - Apple Community

izardoz wrote:

Thanks for responding. Nope she is not blocked. Weird thing is if she immediately calls me again after getting voicemail my phone will ring.

Good information. That means you have Do Not Disturb enabled, and have the Repeat Call bypass turned on. If you want DND and not block her add her to the allowed call list.