She is clearly interested in me, but why does she still ignore me for days?

Ok, I (28) know that she (25) clearly likes me and that she is interested in me because she has said this herself, multiple times. We are also planning our first date, but it keeps getting postponed due to the distance, and also because we both work full-time.

She remembers everything about me from our talks because she sent a very personal gift on my birthday a couple of weeks ago. My only problem is she is being hot and cold. When she replies on WhatsApp or Snapchat, one week it is consistent while other times, she completely ignores it for days.

Now, her replies are far from short or dry. They are always paragraphs with multiple questions. But her inconsistency makes me feel like she is either testing me or my patience. She is a very closed-off person, so she doesn't often open up about her feelings, quite possibly due to her past relationship.

We've been good friends for over a year now, and she has been always like this. I was just expecting her to be more consistent with her replies now that we're thinking of dating, and not just being friends only. I have no problem with postponing our date for a dozen more times, if she isn't feeling ready, it's just that, sometimes this hot and cold behavior makes me overthink everything.

She is clearly interested in me, but why does she still ignore me for days?
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