Need some help for my fiancé

This is a bit of a laundry list, I could use some help and comfort (hopefully) for my fiancé’s situation:

She is healthy (5’8”, 145lb, low body fat, exercises hard 1+ hour 5days/week)

She eats really healthy, like extremely. For breakfast she always eats 3 eggs scrambled and a large parfait of fruit (usually blueberries, cherries, raspberries, tangerines) with a couple spoonfuls of yogurt.

Lunch and dinner are usually somewhat large salads with plenty of arugula and spinach, white and red vinegar, a protein (typically chicken or ground beef), and lots of vegetables like broccoli, cauliflower, onions, peppers, brussels, etc.

She’s on an SSRI, but has been constipated both on and off the SSRI. She’s also taking a prenatal vitamin that we’re gonna try cutting out for starters.

Her constipation has manifested in miniscule or no poops for days at a time. She describes bloating in her stomach which occasionally I can detect. She doesn’t describe pain but a little bit of discomfort.

Can I get a little insight? What might be causing this? What can we try (outside of cutting out her SSRI) that could help alleviate this constipation? Is bloating and discomfort a level where we should be medically concerned? She takes in a lot of food to fuel her lifestyle, but excretes very little. I’m just concerned for her and hoping to get some insight!

Thank you for all the help 🫶🏻