No clue, that's why i want to find out. Got it for free anyway, so may as well.
Card games kinda intrigue me, i feel there's lots of untapped potential there but sadly i hardly ever find good ones.
I took a look at the triggers and two seem suspicious to me:
1. SERA_PREGNANCY_TIMER - This value seem to be active and shows 49 (days?), so i think that since this is active perhaps she is already pregnant and her pregnancy is currently ongoing and you just didn't notice or weren't notified yet.
2. SERA_TALKS_BREED - This value seem to be inactive which could mean that you didn't talk to her about breeding yet? Which could be the bottleneck preventing you from knocking her up but since pregnancy timer is active this is probably false.
Nothing else struck me as particularly suspicious in your save's triggers, good luck figuring it out~