Avoid texting like the devil. If you're going to send her 'text' messaging, make her an invitation to the homecoming dance.
John Smith
most courteously requests the presense of
Jane Doe
on the evening of Sept. 28th for the
Homecoming Dance
Print that or something like it on a piece of white cardstock, trim it down to a square, and rubber cement it to a black construction paper square to give it a nice frame. Then give it like, a pass-through a colonge mist. Just not too much. Then slip it in her locker or hand it to her in an envelope at the end of lunch and tell her she can't open it until her last class, and you'll be waiting your locker for a reply. This makes it a giddy little surprise at the end of the day.
This can go in two ways.
1. She's impressed you actually went to some degree of
effort to invite her.
-Her friends go all 'aaww that's so cute!' and you're in good with them later on when she needs their advise if the relationship is worth saving.
2. She mocks and ridicules you, and the note becomes a laughingstock.
-Her friends all laugh with her but wish their boyfriends did something that thoughtful. Better opportunities come later.
Or just... yeah. Ask her out 'normally'.