Is it rude to split up at an exhibition when we look at art at different speeds?

My cousin took a photo of the painting while I was halfway through its wall label. 'Next room?' she asked. It was the fourth time in ten minutes.

We'd bought exhibition tickets together. She likes walking through once and returning to anything that catches her eye. I wanted to listen to the audio guide and spend time with three particular paintings. Neither of us had mentioned that before arriving.

I suggested meeting at the cafe in forty-five minutes. She said she'd invited me because she wanted company, not someone to travel there with and then lose at the door. I put the guide away, but left feeling as if I'd attended the exhibition without really seeing it.

Should looking together be part of the invitation, or can we have a shared afternoon that includes some time in different rooms?