I’m not 0 certain I understand the question—if the question is, would I have a problem writing her as bi, no, of course not. I think Barbara in Birds of Prey could have made that leap pretty believably.
However, there isn’t a lot in canon to indicate that she is bi at this point, that I can think of off the top of my head. If it was going to happen, I would want it to be organic and believable. There would have to be some foreshadowing, some foundational work. I like those kinds of reveals to be done tastefully and with respect to the character and her history.
So it would take some work, certainly.