Hi blackcatbone,
Sorry to say I'm not female either.

Whatever is going on in Phils nobody yet knows. It could be anything.
But...she knows how to contact you and she can find the means to do so sometime if she wants.
And ....she will know you will be trying to contact her, and she knows you will be very worried.

Many people, I'm sure, have encountered 'tampo' in LDR, it's so frustrating when attempts to contact and communicate are denied. However......
To me this does not seem like tampo, and from what you've said, this behaviour does seem totally out of the character you know.
Unless the episode between you was much bigger than outlined

But..you're correct when you say you have no choice in this. That's the rub! You are under control.

You already made a big emotional investment.

But.... you do have options, and you must resolve to use them.

Try to contact her friends and/or family (but surely she would have found some way to contact you?)

Wait and do nothing (but for how long? You must set limits/boundaries)

Wait and stop all support (If she still needs/wants support for anything she will contact)

blackcatbone, you MUST be prepared for ANYTHING.

Implement your options now.