I really can't answer that for her, because for one, I'm not sure how much she enjoys anal, and for me, regardless of how much I can enjoy it from time to time, it does not compare to regular sex. Even when I'm getting sodomized, I'm still working the growler with fingers.
I've also never had my cervix beaten so bad, I needed a doctor to say no sex. I've had my fair share of big guys leaving me aching and regreting sleeping with them, but never to a medical extent.
I would say just use a vibrator. I'm sure you've got some sort of arsenal to choose from. I'm a woman that LOVES penetration, but an orgasm is an orgasm, if she can get one from clit stimulation, get your face, toys, fingers to work buddy boy!