Absolutely, I think that's a fascinating aspect of her character - one that I'd like to see explored more in some depth, maybe in one or more of her 'darker' tales.
In Harley 'Rebirth' they continued with her striking out on her own, and those people that she does have with her very much work for
her. But those people are so
weird; a talking egg, a talking stuffed beaver, a 'Popeye clone', a Deadpool lookalike named Red Tool, and of course the 'Gang of Harleys'. And the adventures are bizarre. Even for a comic book. Even for a Harley comic book.
Well, it's weird (of course!
). She has people from main continuity turn up (as of course they would if she was imagining), but nothing that happens in their adventures together seems to have any impact on any other titles whatsoever. There's no crossover with Suicide Squad (in fact Harley's character seems far 'lighter' and 'fun' in her own title than in SS) - she does seem to be in her own little world. So I don't
think that would be a problem...