Is this okay for a drop-in?

hiii - from a long-time sitter but from somone not usually on the other end. Looking to request a drop in for my cat later this summer (pic of the diva herself)

My kitty doesn't like new people, so I've never had a sitter even see her when they come by. So it takes maybe 10 minutes to fill up food, check water fountain, and scoop litter. I usually tell people that they can leave before the 30 minutes is up, no need to sit around because she won't come out of hiding.

I am pretty proud of my balcony garden this year - I've put a lot of work into it. I would be really sad if it all died by the time I return. Would it be appropriate to ask my drop in sitter to water my plants? It would definitely still fall within the 30 minutes.

I never mind watering plants for my clients (I usually offer because I am a plant girly regardless), but I don't know if it's universally acceptable