@anders You should probably update your version of LO. Latest is 7.4. I believe the one you have is two years old now.
I would also ask your supervisor for her version of MS Office. Maybe it's an old one and she should be the one upgrading. Alternatively, you may offer to install LibreOffice on her machine. To be honest, I think she should adapt to you and not you to her. I mean, if you're a student, how are you supposed to buy an MSO license? I bet hers was paid by her employer, but who will pay for yours?
@josemanuel Well she is on standard, centrally administered automatically updated windows computers. I actually have access to the same MS-word license. However, I chose to work with GNU-linux software only in my dissertation work and hence don't get support. The university really bought into the whole Microsoft model. I guess my old LO version depends on my debian stable system.
@josemanuel Thank you for feedback. Well, I mentioned LaTeX because I know that this would be a solution. I just don't have the time to learn a new text editor at the moment. Also, I would like to be able to share revisions and comments in a convenient way. I am on LO 7.0.4.2. I also tried to share my text through Nextcloud/Collabora, but sadly it did not come out good in my supervisor's browser. It is still a little hard on the processor and requires a stable internet connection.