I agree with LH, go ahead and answer because if you don't it will come off as petty to her. You said you shared "some good exchanges through text" so you don't want to suddenly go quiet because then it looks intentional.
As a general rule of thumb, you should reply to some texts right away, others an hour or two later, and others (if it's nothing important) not at all. The idea is to look like you are a busy person that's not always immediately available. Now if she knows you are just sitting at home then there's no point, if you don't reply it just looks petty. The idea is to make her think "hmmm I wonder what he's up to" not "I know he's just sitting there ignoring my messages, what a tool."
