It is difficult at times, to know for sure, but to me, it just seems as though she is just wanting to have a laugh for now at least and responding because she has humour.
However, I think it'd be a good idea to just every now and then, say things similar to that, but nothing obvious, then if the messing around carries on, you could then ask her out on a date?
She may be just joining in with the laughs and she probably needs some more time after her ex, before she starts thinking about another, but she sounds like she enjoys your company though.
Don't rush anything just yet - test the waters first, as they say.
However, I think it'd be a good idea to just every now and then, say things similar to that, but nothing obvious, then if the messing around carries on, you could then ask her out on a date?
She may be just joining in with the laughs and she probably needs some more time after her ex, before she starts thinking about another, but she sounds like she enjoys your company though.
Don't rush anything just yet - test the waters first, as they say.