is that Anne herself does not seem convinced that she did the right thing:

"but Anne, at seven-and-twenty, thought very differently from what she had been made to think at nineteen. She did not blame Lady Russell, she did not blame herself for having been guided by her; but she felt that were any young person in similar circumstances to apply to her for counsel, they would never receive any of such certain immediate wretchedness, such uncertain future good. She was persuaded, that under every disadvantage of disapprobation at home, and every anxiety attending his profession, all their probable fears, delays and disappointments, she should yet have been a happier woman in maintaining the engagement than she had been in the sacrifice of it;"

I fully agree with Rachel's synopsis of the situation, and I believe if I had a daughter in Anne's situation, I would really be worried about her. It seems analygous to a situation where my daughter wanted to marry a young man who was determined to move to California to become an actor. Without any current money or any certainty of getting an acting gig when he gets there, I would definitely be hesitant to give my blessing to that arrangement. If he got a job, and then came back for my daughter, then I'd feel a lot better about it. But I guess Lady Russell didn't recommend this because she thought Anne could do better than wait around for Wentworth.