The property is jointly owned and therefore she is entitled to have whatever guest she likes in the property.
Legally straightforward but practically a nightmare.
You can ask the guests to leave when she goes out but she can ask the guest to come back when she comes back.
The fact that you own a larger percentage doesn’t apply to the legal title, only the financial/equitable/beneficial title. So legally you both have the same rights.
Of course there was nothing to stop you moving in with a new partner in the same applies vice versa
I’m sorry, I know it’s not the answer you wanted.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have