I'd have thought post-hoc visits by both an incompetent lame duck PM and a mega-rich elderly person who has had a long life of privilege at public expense is of no value whatsoever given the immediate needs of those affected.
The Queen is our Head of State and I think it is entirely appropriate if she wants to visit and show support for the surviving victims.
Theresa May is the Chief Executive of this country and she bears ultimate responsibility for the safety of its citizens. It's very likely that the investigations into what went wrong will show inadequacies in legislation pertaining to fire safety. Again, it's entirely appropriate that she should visit the victims, although, personally, I can understand why she might not want to in the current climate of hate.
Your original remark was pretty mean spirited.