I think she does say it's taxable. I like some of the blogs I've read of hers. But I don't understand that of the 82 (?) shows she's seen, she's only blogged about 50 or so of them. Maybe some she's blogged about for other publications but then I assume she's not spending the money donated to her for those shows? I'm not sure how I feel about crowdfunding for theatretrips. If I were given £900 or so for theatre visits, I'd be encouraged to write better and more blogs too. Regarding her efforts to see more regional shows, good on her, but it generally costs more to travel to and stay over in London than it does going out of London and stopping somewhere in the regions.
For a moment there I thought it was going to be something like a Kickstarter campaign but it's Patreon, which is somewhat different.
It seems reasonable to me. If she was asking for patrons because she wanted to spend less time working and more time painting, for example, then I don't think anyone would think it odd, but because what she wants to do involves spending money on tickets it does have a scent of "fund my hobby for me" about it. I don't think that's the intention, though.
Oh, this is nothing - I've seen an actual published author of multiple children's books ask for donations from fans to fund a writing retreat. I think she was offering signed book plates or something as a 'reward', as it was a Kickstarter.
And I know of numerous blog writers who have a 'tip jar'.
Personally I find it a very strange extension of American tipping culture, but plenty of people seem to be willing to chip in.