Sakuya is made to break defense. What she does is getting into a certain range and put you on a fake blockstring, then make you fail to block.
To fight Sakuya:
- Don't be in a corner. Use the assist to get out.
- Remember that eating a sweep or throw is better than eating comboable strikes.
- Put her on defense instead.
- Use a character that has longer reach or can zone her.