I can’t call her out for not being able to spell. Some of us can’t and that’s fine. It’s no secret that she’s not well-educated. She may even be dyslexic or whatever.
BUT surely if this is your job, your supposed ‘business’, you’d make the effort to check, double-check and triple-check your work? Especially if you KNOW that spelling and grammar aren’t your strengths? It’s not about her poor spelling, it’s the sheer laziness of her being unwilling to proof-read and edit her content. It looks sloppy and unprofessional. More cool the ‘brands’ she works with. It’s very reflective of their low standards.