Exactly, I'm in an LDR, and it's flourishing. It's not ideal, I would rather be with my partner, but I've been in an LDR almost 4 years, and known my partner for 8, and I expect to be in an LDR for years to come before we can finally be together forever, so yeah, this woman doesn't know what she's talking about.
LDRs work if both partners are equally committed to making the relationship work, prioritise communication (my fiance and I speak for minimum 1 hr a day) and elevate each other. If you see it as an external challenge to face together, you'll succeed. If you're not equally committed, it probably won't succeed.
I think you will succeed. I believe in you. <3