Maybe just let her know that it was rougher than you thought it'd be, and that you have jointly responded by deciding to set specific "home by x-o'clock" times for a while, but that overall you're doing good, feeling strong and cared for in the marriage, and still looking forward to continuing to explore. Assuming that all actually feels accurate? More detail than that shouldn't be necessary.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.