I also saw it on Reuters and one Japanese internet publication, but did not save it. Not only there are complaints to local government authorities and russian embassy, but to Brian Orser. This one is very recent and here it is.
People who follow Med's story closely and digg into details, say that not only mother went with her, she invented the whole tactic of how to cover up her travels to and in Japan with the "show responsibility". Mother thought that all people would buy this, but many people did not ....... from the very start of seing Meda's foto in the airport. We all screamed "this is yet another one of her schemes".
Her mother since after college until now had a media related careers. She is now a high-rank executive in an anime production company, and part of her job is presentations, advertising, and PR. Medvedeva is an apple which does not fall far from the tree.
It was the Mother who went and "knocked on the office doors" of the decesion-making various russian sports authorities to "do something about Zagitova" before the Olympics. It's been 2 years so more people involved are talking about it.
It was the Mother who contributed (to some extent) to Lipnitskaya's and her mother's departure from Khrystalny. Hopefully Lip's mother, who is not from a shy-dozen, will feel free to tell openly everything to the public (and not just to some individuals).
So yes, the mother is with Medvedeva, teaching her the skills, which is fairly common to us russians - how to avoid following rules and laws by going around them to get ahead for personal benefitw with an approach "all is fair in work and sports".