All those articles reduce homosexuality with sex, which is insulting. They reduce it to that and ignore all the rest, the love feelings, the trust, the relationship and the family you may want to build, to something they can debase to fuel their hateful dogma. Tell your mom it's not about sex, and tell her she's a hateful and loveless person. She is the reason for your trauma, homosexuality isn't any more than heterosexuality could be.
Your mom is just showing how little she cares about your feelings, she can't accept them as long as she is a slave to the cult.
The last testimony, and its 3 partners a day "moderate" gay sex lie is so hateful I'd suggest you send a copy to the nearest LBGT association for advice and comments. Maybe get a local journal involved, so the WT and your mom's delirium are publicly confronted with reality. Even when you know that what she says is wrong on all levels, the mud she throws still leaves a trace, and that's not good for you long-term.
As far as the fact she can't believe Jehovah would exterminate homosexuals if they were born that way, she's following the same fundamentalist denial of reality they do on a daily basis.