I think you need to push the bottles out. Start with the first one of the day, get as much in her as you can but don't let the feed run for longer than 20 mins. The next bottle needs to be as close to 4 hours as you can get - distract her anyway you can and she should take a better feed, then you do the same again, hold out for at least the same time as the previous feed or 4 hours if you fed her a bit before that.
I would forget the solids for now to be honest until you are getting more milk in her. She is the very minimum age for starting solids under UK recs and milk has more calories, fats and nutrients than early solids - you need to get her milk intake up to around 28/32oz if you can. Remember that solids up to age 1 are for tastes, textures and practise so there is no rush!
Laura