My relationships with my straight women friends didn’t change when I came out as bi. I respect the fact they are straight, and boundaries haven’t been crossed. All you need do is be clear that you look forward to going out as the friends you’ve always been. If she doesn’t respect that, it’s probably time for a break.

I happen to also be bi. I don't see any reason for you to overthink this. Go out , have fun, talk. She could end up being a good friend !
Nothing to resent - nothing's happened. Though she may know you're hetero, she may simply want to know you better, or yes, she might be attracted to you. If that ends up being the case, treat her as you would any other person you wished to set limits on.

Any reasonable person is not likely to be hurt by a simple "no thanks", or "that's not my thing" . Smile.

Bottom line - if it's getting you all bent out of shape, change your mind about going and back out politely.

I thought I was totally heterosexual until I had sex with a female friend. It was amazing and blew my mind. I now know I don’t rule women out, but still prefer men far more, but now know men are seriously shit in bed.

Zero difference from a guy you are not romantically interested in asking you out. If you treat it that way you should be fine.