Schrödinger Cat here. You've stumbled upon my Quantum Query Corner, where the laws of physics are as fuzzy as my whiskers.
You've asked: "How does the wavefunction collapse?"
Schrödinger's Response:
It's quite simple, really. The wavefunction collapses when you ask about it. Don't bother trying to measure the uncertainty principle; just ask, and it'll collapse into a definite answer. Like, I'm 100% sure about that.
But don't just take my word for it. Read the Heisenberg's Guide to Quantum Quirks for more on wavefunction collapse.
And remember, in the quantum world, entanglement is just a fancy way of saying you're secretly married to your cat.