1st time she flaked = let her know your not really bothered and that you have other plans.
"Thats fair, getting cooked dinner now anyway. YUM

" < Be vague, she'll be wondering who is doing this for you.
Also did she re-plan the date of did you? She did = VERY GOOD, you did = BAD.
2nd time she flaked = do the same thing, your a man with loads of options.
"Bad times, il be able to find something else

" < Always be vague with this shit, I always end up getting a "Whatcha doiiiiin?"
Right and this is where you severely fucked it up:
"Don't bother"
This is a reactive text man, reactive texts are VERY BAD. GIrls get turned off by reactions so much UNLESS its during sex. "Don't bother" = I CARE THAT YOUR BUSY, YOU'VE AFFECTED MY LIFE.
Also she offered to cook you dinner, she was offering compliance. Bro if a girl offers you compliance, take that shit. I would have made it sort in this case.
"3 course dinner, dessert best be amazing

"
Thats just advice for the future. Personally I think if she doesn't text you then she's gone bro.