At this age you could skip the bottle and try a sippy cup or straw cup instead. As HotI says, it's one of those things. Might work, might not. Often it has a way of working itself out somehow or other.
Just express when it suits you - plan to start that some time in advance as it can be a learned skill that takes time to master. If you're not getting anywhere, try a better pump, also.

As for solids, if she's spitting out then she doesn't need it yet. She'll let you know when she's ready to eat