Latching issues - 6 weeks old

Samantha
My baby girl is almost 6 weeks and has seemed to forget how to latch properly. We did great from 3-5 weeks and I felt like we were finally on the up with breastfeeding and we could efficiently nurse in 5-15 minutes. Now it's taking 20+ minutes because she falls off the latch, getting too shallow of a latch, or is hurting me so I unlatch to try to reposition. It feels like we are back in the newborn phase again! Anyone else experience this? Any tips? I don't have a LC in my area. 
She does have a slight tongue tie and I wonder if it's now starting to effect her... Talking with the doctor this week about getting it clipped. But until then, help!!