There are plenty of frum lawyers in BigLaw. It’s not easy, but it can be done.
Even with a lot of debt, proportionally speaking you’re still financially much better off with high income and high loan repayments– yes, even if you’re making the payments for a very long time.
You’re also much better off as far as career stability. The job market for lawyers is very tight right now. Without a degree from a good school, you could very well have periods of unemployment.