Update: what advice can we (35 M&F) give to our niece (18F) so she doesn?t ruin her life?

Since I?m stuck at home, I figured I?d update this post about how we could help our 18 year old niece not throw her life away by moving out before finishing high school.
Well guys, she did it. Michelle moved out and claims to have married her boyfriend. However, we?re 99% sure they?re not actually married, but they think they are. See, Michelle doesn?t know that you don?t get married when you go get the marriage license at the county clerk?s office, you?re married once an officiant fills out the goddamned paperwork and sends it back. So far the last part hasn?t happened yet.
She says she still wants to have a real wedding at her grandma?s church, but doesn?t understand that she has to go through at least 6 months of counseling and religious stuff first (it?s a Catholic Church and she never got first communion so she?d have to do that and confirmation first), plus the priest won?t marry them if they?re cohabitating, which they are. Add in the prom-like, all purple decor she wants but can?t afford, everyone but Michelle knows that she?s not gonna get her dream wedding any time soon.
We took the advice of the kind people from my previous post, u/RodeoBob in particular really got through to my SO. My husband took Michelle and her SO out to lunch, and the silver lining is that the guy doesn?t seem like a bad person. My husband said he was basically Jason Mendoza from the Good Place, so at least that?s a relief. He and Michelle have been texting back and forth, it?s been cordial except for when she asked us to build/pay for an elaborate alter decoration trellis-thing for her wedding, and he replied that he?d consider it once she finished high school and not a minute before then. She ghosted him for about a month, but has recently been in touch. At least she still considers us an open line of communication.
Beyond that, it?s not great. With school being closed, we don?t know if she?s keeping up with her course work (I don?t know how she could because I don?t think she has a computer), and since they both work in the food industry Michelle and her SO aren?t working right now. On the advice of his uncle, my husband will offer to help her apply for unemployment. I hope to God she wasn?t being paid under the table at her last job, but I have a suspicion that she was. My SIL/Michelle?s mom?s situation has also deteriorated, so in some ways it?s better for her and the other kids that Michelle is on her own, but it?s just garbage fires all around.
TLDR, it?s still a bit or a ****show but I do really appreciate the advice you all gave me, it really helped give us some perspective. At least now we know where she is and Michelle knows she can call us for guidance and support, even if we won?t swoop in to rescue her from her mistakes.


Source.