Kudos for working through the cheating start. That's not easy.
I'm not sure you all three have sat down to discuss what this new polyship will have for rights and responsibilities. These are my playbook
for how I roll.
She sounds caught up in NRE -- new relationship energy and not balacing out with the ORE -- your older relationship that's already established.
So... I'd bring it up to both. Get a plan for the next (time frame?) to see how to best deal in time management so that some of your needs are being met too.
We don't all always get the megaHAPPY... but we can strive for "a reasonable happy medium" for all.