Girls, She texts me "hey" and then doesn't really respond?

Hi all, I've been "talking" to somebody that texts me in a fashion I'm not used to.

There are days where she'll text me "hi!" or something else super short, or sometimes a question (like "hi how is your weekend?"). What I've noticed the past 2 weeks is that after I respond, she sometimes doesn't reply back at all. It's happened about 4-5 times now, and I'm super confused on how she expects me to respond. Am I supposed to double text her (even though I never do)? All help appreciated!

Girls, She texts me "hey" and then doesn't really respond?
Post Opinion