Besides the fact that it's a tier I, she'd be playing her first tournament in her home country. It would mean a lot to her and to the people of Russia. At the same time, if she's injured, there's always next year.
Getting back to the question - it depends what this injury is?
I really think Maria wants to play the Kremlin Cup this year - so if she plays anything it will be this and the YEC. She's also scheduled to play Filderstadt and Philadelphia. I think those are probably going to bite the dust now, to give her muscle time to heal - but I think she'll play Moscow if she can.