I believe it’s all a lot more simple. Prior to being refused carers the account was fairly niche, very much a SEN account, and had ~10k followers. When the carers were refused she got a lot of media attention, celebrity attention, her followers shot up to ~50k, and she got her blue tick. That in turn resulted in all the ads and thousands more for her fundraisers. Her insta career is almost entirely based on the injustice of being refused carers, even though they are yet to be taken away.
The narrative is and was that the decision was unjustifiable because J’s needs are so severe and Kaytee is a single mum trying to work as a nurse (but being unable to due to lack of carers). She plays down help from family, friends, and J’s dad to enhance the narrative. All the stories about referrals, GOSH, and private doctors add to this narrative. As do battles with doctors who have only offered her two potential solutions to the vomiting.
Kaytee almost certainly gets better engagement for her posts and stories about her battles with the health and social care system than for her ads or personal stories. So for her insta lifestyle to continue there has to be drama with J’s care, there have to be doctors who are wrong and won’t listen to her, there have to be trips to GOSH, and there has to be a sense of injustice over the carers and J’s treatment. That is what her following are there for.