Can't blame her, I guess. Ask for a lighter schedule, and not only get fired but effectively another person gets hired to play your character.
Not getting your contract renewed is NOT the same as getting fired. Getting fired means you've been terminated for cause, something you did wrong or something you were obligated to do and didn't. Not having your contract renewed does not imply any fault - needs or desires may change, or just couldn't come to an agreement on money and working conditions.