Her son is 7 (some media outlets initially misreported 5), and presumably her wife or girlfriend gave birth to him seven years ago, when she was 29.

Maybe that was pre-transition for her, or maybe it wasn't; some trans people are perfectly fine having penis-in-vagina sex even if their anatomy doesn't match their self-identified gender. Anyway, that's just a guess; the public isn't currently privy to those details.