You could leave her with me! (I wish!)
I would think about the pros and cons of each(although I am sure you have already done that) and go from there.
Leaving her at home:
Pros:
Bunny in a familiar environment
Less stressful for bunny
Cons:
Sitter may not know how to care for bunny very well
She may get lonely
Expense
Taking her along
Pros:
You can continue her normal care and can watch her well
She wont be lonely
cheap
Cons:
stressful for bunny
If you choose to take her with you, I wound find out:
What will her setup be like at the family’s home?
Are there small children/other pets that could be dangerous to bunny?
Where is the nearest exotic vet to where you are staying?
Will family coop with her Hay/litterbox/floortime?
Either way, I would go for a “well bunny” checkup before vacation to ensure she has no conditions that could causes issues.
Sorry if this wasn’t any help/just gave you more to think about, I have never personally traveled with my bunnies. Hopefully another member with more experience will give you a more definite opinion on what to do. You are doing a great job to think about this early, a and I hope you have a great trip!