Just be playful & fun.
I constantly send little "ping" texts to different girls... even if I haven't "spoken" to them in weeks or months. (In one case it was over a year).
But because my texting style is soooo different from every other guy texting her, she immediately knew it was me... even though I texted her from a new phone number she didn't have and I never said my name.
When you're fun & original, girls will NOT forget you.
I use texting for flirting & setting the meet up... but especially for flirting.
A lot of times, I'm pretty random & spontaneous with my texts.
I'll send things like:
"I just saw a little girl push her brother down & take his toy... made me think of you. "
"Hey, if you were me, would you choose pizza or tacos for dinner tonight?"
"Hey Spunky-Pants, need your help! Do bow-ties go okay with a welding mask?"
"I was just thinkin... if you were here right now I would totally buy you this puppy. He's totes adorbs!!"
Stuff like that will almost always get a reply, because it's most likely going to put a smile on her face. (And probably make her laugh)
And it's THAT kind of stuff that will subconsciously cause her to Anchor feelings of fun & playfulness to you.
The thing is, you don't have to be having pizza or tacos...
There doesn't have to be a little girl pushing her brother...
You don't need to have a bow-tie or a welding mask...
There doesn't have to be a puppy anywhere near you...
All you're doing is triggering a funny visual image in her mind & having fun... which she'll associate with you.
Just do stuff like that regularly & pretty soon she'll be blowing up your phone & practically begging you to meet up with her.