I don't know how to help my gf sex drive

I (34M) have been with my gf (28F) for about a year. The relationship is amazing and I love her with all my heart.

The only issue has been sex. She has had some sexual trauma in the past, but I don't know exactly what because she's never discussed which is fine.

For the first 8 months our sex life was decent. She had a decent sex drive and would actually wake me up for sex pretty often. We usually had sex at least once every weekend. I wanted it a lot more than that, but I was willing to compromise.

I don't know what happened, but the last 4 months her sex drive has tanked. One thing is she missed period, we did pregnancy tests and she wasn't pregnant. She had her period a month later so no issue. But since that period she hasn't had one in over 2 months. We've only had sex once since then, so about 3 months, and I wore a condom and didn't orgasm during sex. We did a pregnancy test anyways and she isn't.

I've talked to her about trying to improve our sex life and she really wants too, she just doesn't know how. Do you guys have any tips? Sounds like maybe her hormones are out of wack with the missed periods, but also maybe past trauma?

I really want to make it work, I love her so much. I know she does too, she regularly tells me I'm the best thing to ever happen to her.

Anyone have similar issues and found ways to improve?