You're doing we'll that she sttn, my lo still doesn't at 6.5 months. I never had a feeding routine with lo either and she was ebf, I fed her on demand and its worked out well. She's weaning now and I feed her in the morning when she wakes, then at about 10am (short feed to sleep, more a comfort thing), then again short comfort feed to nap at about 2pm (although she fell asleep alone today) and a "proper" feed at night before bed.
My lo was the same as yours in terms of feeding a lot, I'm so glad we're onto the weaning stage now and she eats three meals a day and the breast feeding has become less, it can be really draining and I found quite smothering too - lo is a bottle refuser and it kinda got too much a couple of times and I just wanted 5 minutes to have a breather.
I think you'll find a routine comes into place when you start weaning, whenever that might be, I was worried about that but it seems to have been a gradual process where it slotted into place
Xx