Simple.
1. Assume an ostensibly correct pronoun of your own choice (like you did)
2. If someone corrects you, optionally acknowledge the correction and apologize if applicable, then use the correct pronoun henceforth
3. Ignore the overly gender-obsessed people who tell you that you should have used ugly or cumbersome constructs such as "they" or, even worse, "s/he" and variants thereof.
4. Don't worry too much about it; everybody can make an honest mistake.
2. Take the time to use a search engine to look up her name, which is referenced at least two times in screenshots of emails she provides.
3. Click-through to the blog post she links, also written by herself: https://patentpandas.org/stories/crowdfunding-backer-patente...
With that perspective, this board game patent actually looks very good. It certainly isn't an idea that I've thought of before or seen.
In the context of her story, gender is not relevant; she apparently didn't think so either, since the only way I could tell from the article was her hands shown in the last picture.
There's no reason for anyone to get worked up about it.