Bad eater at 8 months

My baby will be 9 months soon and is starting to become a bad eater. She was severely constipated last week so we gave prune juice, Mira lax and suppository per pediatrician recommendations which fixed it, but she still lost 2 oz in 2 weeks and is getting worse and worse about eating (whether breastfeeding, bottle or purées). She just doesn’t seem to want to eat much. I do know she’s teething (4 teeth). Will it get better? Is it normal to go a few weeks without eating well while teething?