Actually if u used to give her the bottle, I think it's not baby associating mummy and breast only issue.
I suggest to check the teat of the bottle - is this a new tear that u are using ( baby doesn't like the flow rate) or a seasoned teat - it could be leaking milk on its own (wear and tear too) and baby won't like it too.
Is baby sick or in discomfort or sleepy/cranky or just recovered from an illness bout? I discovered my boy only wanted to boobs after his hfmd episode (they had to tube feed him as too many ulcers in his mouth/throat) and not the bottle - so it could be for comfort too.
Experiment a little. I understand the stress, my boy (4m) also like that for a short period of time. Jia you mummy. At most wait till really v v hungry they will no choice but take bottle
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