Mr. Pink
Happy Birthday in advance.
It's a matter of your choice & style and dependant on how well you know your target. Texting would be fine, but I think it would be better to phone her. There's pros and cons to both, but i just hope this chick isn't bringing out a one-itis streak in you.
Whichever way you choose won't matter too much, the tone in which you tell her will; this is why i recommend a phone call. I feel you should remind her in a casual way, just as a reminder phone call and you can mention that you noticed her fb was deactivated but not in an inquisitive manner. You don't want to come across as desperately wanting her to come but you want her to feel that her presence there would be appreciated and that it WILL be a fun time out. You could even just make a quick call and hang up soon after the message has been given.
Hey, i'm kinda busy, just reminding you to bring socks cos we gonna go bowling after predrinks. Pretty keen for an awesome night out.
maybe you want to add :
"dont forget my present
"
if you're texting: assume she is coming.
Three things. 1-Socks for bowling. 2-Awesome present.
I know its only two things and I mentioned three but thats fine and might get a response out of her. If she doesnt attend or cant make it, she's not worth it or genuinely cant make it. Again dude, it really depends on your style and the relationship with the target so if the advice doesn't suit the occasion, dont follow it.
good luck