Come on parenting book readers, tell me what this is about!!

E is 2.5 and very verbal. For 6 months, she has been confidently articulating her choices. But all of a sudden, this fake crying has started - it sounds like a machine gun - and she does it constantly. Its really bloody annoying!

This morning, the exchange went like this:

[E had come to the table of her own accord and asked for toast for breakfast]

E: I have jam, please?
Me: Yes, of course. Do you want strawberry jam or marmalade?
E: Hehehehehehe (fake crying)
Me: What's the matter?
E: Have jam, waaaaaaaahhhhh.......

Then, earlier:
E: Have my stickers hehehehe waaah
Me: Okay, here they are....
E: Hehehehehe waah..... [plays with stickers]

I'm baffled. She surely knows she can just ask, with words, because she has been doing it so nicely for so long. Why the dramatics??