What to do if she switches from texting to only calling you

Start with what came before the call. If your texts were short and she suddenly rings, she may be tired of thumbs, or she has news that is too long to type. If she called at an odd hour, she may be bored, a bit tipsy, or stuck somewhere she can talk. Look at the last thing she sent. A question she never answered tells you more than the call itself.

Also check how she behaves across the whole conversation. Some people treat phone calls as their default and only text to set them up. If she has done this since the start, the switch is not a change at all, just you learning her style. If she has never called before, treat it as a request for something specific, and work out what that is before you call back.

Your reply has to close the loop she opened. The call came in without a plan, so the most useful thing you can do is answer it with a clear status: you are free, you are busy, or you can talk at a specific time. If you were busy, say so and offer a window, not a vague maybe. If you do pick up, keep the first thirty seconds simple so she can steer where the conversation goes.

Keep the message about logistics, not the content of the call. Don't ask what she wanted before you have set up a time to hear it, because that turns a casual call into something she has to brace for. A real time she can actually use is what she needs to know.

Call back within the hour if you can, even if it is only to say you are in a meeting and free at seven. If the call came late at night, wait until the next morning and keep the callback short. Two missed calls in a row with no text from you looks like avoidance, so don't let the second one go unanswered.

If she doesn't pick up or reply to your message, give it one more try at a different time of day, then stop chasing. A third text asking whether she got your message reads as pressure. If she has been warm before and goes quiet for a few days, she is probably busy or unsure, and your next message should be light and easy to answer, not a demand for an explanation.