sleep training, eating solids, not nursing??

over the last month we have introduced our now 8 1/2 month old to solids, I was nursing her about an hour after she had a solid meal, first thing in the morning and right before bed. now that we are sleep training she doesn't nurse over night. she has a good feed right before bed and right in the morning but now she's not interested in nursing mid morning or hardly throughout the day.. help! I want go keep breastfeeding at least until 1 year or longer.. not sure if this is a phase or because of solids or sleep training.