Yes quite. As pp has suggested, depending on your chemo schedule, something you might feel up to on the Sunday would feel like hell on the Saturday.
Also, whether it offends feminist sensibilities or not, the men’s final is both the peak and the grande finale of the tournament. It’s probably the event the LTA (of which she is patron) will want her to go to, for anything from TV ratings, to giving a boost to a washed out tournament that’s had to compete with the Euros, to giving a thank you to the staff on the last day.
The ghouls and republicans - calling her lazy, wishing worse treatment on her (which is tantamount to wishing pain or worse on another human being) because of the state of the NHS and benefits system, and blaming her for the words of a tabloid hack in order to boost whatever pathetic cause you are advocating for here - must live small lives.