I have to disagree a bit with NessieNos.
Lucy's conversation with Caroline does start off with Caroline bringing up both her relationship and Lucy's recently ended relationship, so I'd consider that a bit iffier than her conversation with her mother. Both of them do have brief amounts of time where they do not discuss men.
The handful of other female characters ~(3-4) are unnamed and do not speak, simply exist in the background, while there are probably around 70 men with speaking parts, and hundreds others shown in the film. It was staggering.
I also don't think that Lucy is an "impressive heroine" at all. The film certainly tries to depict her as that, but at the same time none of her ability (or really her will) to do anything against the bad guys was her own. She got saved, essentially by magic (it was not science), got revenge, and that was it.
She wasn't a survivor, a fighter, and by the end she wasn't someone who cared about those around her. She was nothing.
Other than that, this is a film primarily about a female heroine being victimized and fighting back against a series of male enemies, surpassing a series of male professors, and using a series of male cops. It isn't very strong on the Bechdel scale, but it has a very impressive heroine at the center of the entire story.