I love this scene a lot and it lives in my head rent-free. I can't really think of another way to interpret it other than that this is elle telling reid that the reason he can't get a date isn't because of something wrong with him that he needs to change but simply because he doesn't ask people out (or, more broadly, lacks confidence).
I have seen some spencelle shippers read this as elle saying "hey. ask me out" but i disagree, not because i don't ship spencelle (i sort of do, elaboration in the notes) but for the following reasons:
I think elle would have realised very early on that if she was going to wait for reid to ask her out, she would be waiting years
i don't think she gives enough of a fuck about gender roles to wait for The Man to ask her out
she generally seems confident
i lean more towards her being very new to the BAU in the early episodes. I don't recall right now if there's an official anti-fraternization policy or if that's a fanfiction trope, but even if there isn't, entering a relationship with a coworker that early on is an easy way to mess up her career.
i think she was waiting until she was more established to start anything, but then, well, everything happened, and she left before becoming established enough to feel comfortable taking a risk like that
