This is tough isn't it? DD refused a bottle completely until about 10 months.
Also, she was low birth weight and I was under a lot of pressure to get more weight on her, although in reality (and hindsight) she was fine, was a small baby, is a small child, will be a small adult, thats how it is. But we were given a lot of incorrect and damaging advice and I spent a lot of time forcing her.
As it happens, she ate a lot less breasmilk when she was teething, which was almost constant at this age and she also woke 1.5 hourly at night for a feed for a while (my fault, different story), and I had to gradually wean her from this.
I actually stopped forcing the bottle in the end as it was so stressful, and after seeing one lovely health visitor who told me I shop not put pressure on either me or her, it was not necessary and she was small but not ill. With my next one I know so much more, and will do things much differently.
We did start weaning at 5 months, but only because she was showing all the other signs for it. I agree that if she is not wanting solids, stop offering, and re-offer again in a month or so.
If she is not wanting a bottle, just give her breastmilk as she wants. It is perfectly fine for a baby to just have breastmilk (and it often seems they are not drinking much, but they are getting just what they need) I know it is very tiring with her waking at night, but this stage will not last long, I promise.
Good luck