Recruiter reached out, then ghosted me

Hi all, I had a recruiter reach out to me on Linkedin and connect with me as well regarding a job. When I said I was interested in the position and having a conversation she just... stopped responding. The job is legitimate, and she works for the company (I checked).

Why reach out about an opportunity and then just ignore the person once they reply? It's been 3 weeks now.

I am extremely burnt out at my job, so having this little glimmer of hope to move into a more specialized part of my field was great, and then just silence...

Maybe I am just venting at this point, but it's pretty unprofessional.