Why does she text me every day then stop?

Look at what the silence actually is before you decide what to say. Four days of nothing after daily texting is a change in rhythm, and rhythm changes usually have a cause outside the conversation. She may have had a busy week, a family event, a bad day, or a friend who needed her. She may also have decided the texting was going somewhere she is not ready for. You cannot tell which from the silence alone.

What you can read is how she texted before it stopped. If her messages were warm and she asked questions back, the stop is more likely about bandwidth than interest. If her replies were getting shorter or she stopped asking you things, she may be pulling back. Use that to set your expectations, not to build a theory.

Two kinds of reply fit this situation. The first is a light, specific message that refers to something real from your conversation, something she said that you can add to without asking for anything back. The point is to give her an easy thing to respond to. The draft should be short, mention one concrete detail, and end without a question that demands a full answer. You can tell it is working if it reads like you were thinking about her, not waiting for her.

The second kind is a plain low-stakes check-in that acknowledges time has passed without making it a problem. This one is for when you want to show you noticed the gap without making her explain it. It should leave out any mention of how long it has been, any hint of hurt, and any phrasing that suggests she owes you a reply. A draft is right if it could be sent on a normal day and still make sense.

Timing decides how the message lands. Send your single message at a normal hour when she is likely awake and not scrolling in bed, usually late morning or early evening depending on her routine. A 2am text after a silence reads as anxious or lonely, even if the words are fine. Give it a day or two before you follow up at all, because a second message in the same week often looks like pursuit.

If she replies, keep the thread light and let her set the pace. If she does not reply after one message, wait several days before anything else, and make the next message a different kind, not a louder version of the first. If there is still nothing after two gentle attempts across a couple of weeks, stop. Silence after that point is a clear answer, and continuing to message only costs you the dignity of having let it go.