A victim will go after the perpetrator. If the shooter was actually a victim, she would see the pastor's daughter as another potential victim of the pastor like herself and would not want to do her harm.

On the other hand, if the pastor was trying talk her back into being a women and she started being conflicted internally, she might snap and start seeing him as the reason for all her problems and want to seek retribution by any means. The real reasons for all her issues may not be clear at this point yet, but the groomers that talked her into trying to change genders are definitely one of them.

In addition, she was planning to shoot up other schools before giving up on them due to their high security per the article. If she was trying to get revenge on the pastor, why plan those school shootings as well, unless they were linked to other people who wanted to convince her to return to being a normal woman. What would the chances be of all of those schools being linked to people who molested her?