How old is the daughter ?
The fundamental issue with this scenario remains the same in that no doubt the daughter felt different to her peers prior to her transition yet that fundamental issue was never resolved even after gender reassignment.
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No doubt the mother cares about her daughter and has done what she felt was "right" but letting her daughter make such a life changing decision at an age of immaturity is shameful/immoral and becoming all too common.
Here we go with the ill informed jumping to conclusions again.
Firstly, gender dysphoria is a massive issue for trans people, it's not just some switch that can be flipped and 'resolved'. Many battle with it throughout their lives. One thing is clear though, continuing to live as your original gender can seriously exacerbate the issue. It is literally impossible in most cases to deal with gender dysphoria and the associated conditions by continuing to live as your birth gender.
That alone reads like your typical teenager in modern society particularly in the days of social media. Literally every goth/emo, nerd, ginger, fat, skinny kid felt that way during their teenage years.
In the case of Emily here, her mother had to pull her out of school due to how intense the level of bullying she was receiving was. That bullying was also aimed at her school friends for merely associating with her, they all eventually stopped hanging around with her. So she was heading to school everyday, with no friends and being subjected to the most horrific bullying and from what I can tell her mental health was taking a severe nosedive as a result.
So what should a parent do in that situation?
Continue to send them to school into the constant bullying? Take them out of school and homeschool them (and all the associated issues that go with that, or force her to go back to another school as a boy, causing untold damage to her mental health?
The school, for the record, were of little help. This is a common theme amongst trans youngsters. It feels like the school purposely do as little as possible when it comes to the welfare of young trans people as it is easier to palm them off somewhere else than to take on the associated difficulties that can arise (changing rooms, toilets etc.)
The idea that you are comparing this to run of the mill school bullying is showing yet another level of your ignorance on this subject.
Growing up gay was difficult enough (I was a very confused young man) but from what I've seen, growing up as a young trans person is on another level.
Please take the time to actually learn about this stuff before throwing your opinion out there - it's making you look incredibly ignorant.