I didn't even know this was an issue.
This is what i have literally been doing and its never failed me.
When either singularity or soul crush hits, she holds them for a moment.
As soon as you see the purple telekinesis on their head just hold your MB button then.
The only move she has that actually needs a timing, is the demon stance singularity. But you can just hold your MB button as she is sucking them towards her.