Ambrose told me that told Adrienne she spent too much money.
How did Andreinne spend her money?
She wasted a lot of her money by going to the mall.
While saving money is important, it's not always a good idea to give people financial advice and opinions when they did not ask for them. It is very likely that  Andrienne had a valid reason to spend how much she did and it's not the business of anyone else.
You are right. I should have been supportive.
It's not too late, maybe you can tell Ambrose to refrain from making comments like that in the future and why it can be harmful.