I would send a 'fake' disqualifier such as:
"Hey (name), I just thought I'd shoot you a text to say goodybe, you see..Aliens have come to abduct all the sexy people of (your city), but dw you'll be saf

" that'll catch her attention very well.
or try
"Hey, you know I was going to ask you something really important, now please answer this as honestly as you can ok? I can't hold it in anymore, I have to know."
then let her reply with what? or huh? or whatever she'll be curious, then u pop the question which is somethign totally silly and lighthearted. eg. what's your favorite ice cream flavour or... what do you like better, white, dark, or milk chocolate?
u get the point ..along the lines.
Hope i've helped, keep us updated.