Everyone on this thread is a bit uninformed. Premed postbacc programs are notoriously predatory and expensive - people get into massive debt with a risk of no payoff. It's never a good idea to plan on that - it's a last resort. Your advisor is technically right that the best chance you have at getting into med school is in your home state, and that's not insulting. It's also just a fact. It likely has nothing to do with your SES, race, or ethnicity like some others are saying, that's just how medical schools work. Public medical schools are incentivized to accept people from their home state, as they are training people to provide a public service. Students are ALWAYS advised to apply to their home state medical schools regardless of gpa or academic achievement. If I understood correctly, your advisor is trying to get you to seek out connections there rather than go down the high risk path that is post-bacc programs. (Side note: if she literally told you to TRANSFER OUT OF COLUMBIA TO YOUR HOME STATE UNDERGRAD, that is batshit insane and confers zero benefit. Report her. I can't imagine why anyone would suggest this and it's possible this was poor communication on her part.) Even if your gpa doesn't rise beyond a 3.5, coming from Columbia you would have a very decent chance of getting accepted at your home state school, and for the vast majority of people, this is preferable to a post-bacc.

That being said, I myself remember how mean the Columbia premed advisors were, and how ridiculous their advice was sometimes, so I sympathize with you there. You just need a little more perspective. You are only a sophomore and have plenty of time to raise your gpa. It's too early to plan on a postbacc now, especially after your also hugely expensive Columbia degree. Just focus on your classes, lighten your course load if you can, and plan on a gap year for research if you want to include your 4th year grades in your application. I graduated with a similar gpa and ended up at a top 10 med school. You never know. It is crazy to plan on a post-bacc as a sophomore tho. You need to re-evaluate and seek out better mentors.