The phrase "clear her mind" is grammatically correct and is commonly used in written English.
Example: After a stressful day at work, Jane decided to take a walk in the park to clear her mind.
But she can't clear her mind of the past.
"It's really hard for her, but she needs to clear her mind and keep fighting".
Interpreting is demanding and exhausting work, so give your interpreter frequent time-outs to rest and clear her mind.
When Daisy wants to get away and clear her mind, she retires to an isolated shack by the sea.
With the Detroit Shock's season on the line, Deanna Nolan walked away from her teammates and opponents and tried to clear her mind.
When she tugs at the clouds of fog that swirl across the stage it's as if she were trying to clear her mind.
Hingis cleared her mind after Wimbledon, then began drawing up blueprints to defeat the Williams sisters.
The 26-year-old community college student lies still, clears her mind.
Lucia, the cocky, troubled protagonist of Jesse Ball's newest novel, may not like going to class, but she does enjoy browsing the shelves of her school's library, clearing her mind, scanning almost meditatively for something that catches her eye.
Only at this point, when all is clear in her mind, does she make an actual blueprint of it.
Then came a sound so clear in her mind that, for a moment, she swore it had to be real: gunshots.
