According to several Telegram channels, on June 3rd Denisova was added to the database of the site of Myrotvorets Center - an Ukraine-based NGO. The site publishes personal information of people who are considered by authors of the website to be "enemies of Ukraine", or, as the website itself states, "whose actions have signs of crimes against the national security of Ukraine, peace, human security, and the international law". The site has reached a certain degree of notoriety as "the list of enemies of Ukraine", and multiple organisations expressed concern about the Center's activities. The screenshot in the twitter post linked in the question does seem to match the site's look.
Denisova's profile is currently unavailable on the site, original messages in the channels reporting this event are, for the most part, deleted (which prevents finding the point of origin for the statement), but some reposts did include screenshots; and on June 4 other sources already reported not being able to access that profile.
The answer to your question is thus: even if she was added to said list (images can be altered, after all), it was for an extremely short time and then the entry was deleted, which implies that the entry was in error.