This girl..

[MackCrack]

If you don't really like her then don't force yourself. The best way is to tell her the truth rather than making the problem bigger.

[Baked]

If you like her and she obviously likes you.

Just tell her " I don't feel like texting, we should hang out ( insert day ), maybe go ( insert place here )."

She will be flattered and probably blush, then you just bought yourself some time.

[Swat Runs Train]

It seems to me like you are judging her conversational abilities when the only conversations you have are via text, I know I definitely am not too good at holding a decent conversation over text messages, so I would say arrange a meeting and see how things are in person.

[DaBaws]

I talked to her alot of times, on the phones.
She's just began acting immature, and stupid.

It 'turns me off' as hell.

[Baked]

I talked to her alot of times, on the phones.
She's just began acting immature, and stupid.

It 'turns me off' as hell.

Just ask her, "Why do you do that ? I want a girl that I can talk seriously to."

Trust me man, immature girls aren't worth it.
They will just end up screwing you over, you have to come clean with her.