The company my other half works for has recently employed a new admin assistant, but she is constantly making basic spelling and grammar mistakes.

A few examples would be which/witch, your/you're, their/they're/their. There are also a few basic words which the spell checker can't even suggest the right word.

What should be done under this circumstance? They don't really want to fire her because she works hard.

The only thing I could think of was to bring it up in a review and ask her how she thinks it should be dealt with. Then steer her towards suggesting she studies the common ones online in her own time.

I have also suggested a basic test to prevent this happening again for the next people they hire.

The company my other half works for has recently employed a new admin assistant, but she is constantly making basic spelling and grammar mistakes.

A few examples would be which/witch, your/you're, there/they're/their. There are also a few basic words which the spell checker can't even suggest the right word for.

What should be done under this circumstance? They don't really want to fire her because she works hard.

The only thing I could think of was to bring it up in a review and ask her how she thinks it should be dealt with. Then steer her towards suggesting she studies the common ones online in her own time.

I have also suggested a basic test to prevent this from happening again for the next people they hire.