Where on earth did Alice Huang disappear to?

Was she caught by US intelligence agencies?
Or did she flee to China?
Or was she killed off without anyone knowing?
If she really is a Chinese spy, the US wouldn't just sit idly by...
It's possible the Chinese side eliminated her to destroy the evidence instead.
Even if she tries to hide secretly in China, in today's world, the US would be able to identify her through their intelligence networks.