Can my diet be causing baby's constipation?

My baby girl is 8 months old on breast milk and solids, and has been constipated for several days. I don't think the solids are the cause as she has been on the same foods and amounts for some time without issue, including foods that are natural laxatives such as pears, dates, and apples.

I've been off dairy since about 4 months because it was causing her reflux and excess spit up. She's been tolerating yogurt just fine for about a month, so I've recently tried slowly reintroducing into my diet.

Wondering if reintroducing dairy could be the cause? Anyone else have this experience?