should i text her ?????

[Hgb Fgh]

hello recently this girl i used to talk to found me on instagram liked all my pics and asked for my #. i gave it to her and me and her starting texting. its really weird because she would text me saying hi or sumthn. ill text her back and after like 2-3 texts she does not text back. she also takes about a hour or so just to reply back. i really dnt understand because she textes me first lol sometimes i text her and the same thing happens. should i keep texting her ?? should i ask her why she doesn't text back ??? girls help me out why would she not text back just curious.