Cat home alone

It's not an ideal situation but you could leave her if you have secured the house of things she could get caught in it cause mischief! 
 

The automatic feeder and water fountain are great for this situation but I would recommend getting multiple litter trays and leaving them out so she can do her business in clean areas.

If you have the resources you could set up a camera that you can access via your phone to check in on your fur child!