There's a decent chance she was so casual about it because she knows it was a dream and that dream logic was therefore in effect. If there hasn't been any other red flags, then chances are that you and your marriage are doing fine. If you're seriously that worried about a dream, or there have been other red flags- or, hell, you just want to make sure the two of you communicating well- sit down and ask her to write out everything that she feels like you need to work on, she needs to work on, and that you both need to work on together. You do the same. Then the two of you look over the lists, and discuss the "issues," and decide which ones to keep, and make consolidated lists for all three categories. Ask if there's something she's been wanting to do, and don't shoot her down on it immediately. If you have concerns, voice them in a reasonable manner. Discuss things like setting up a college fund for each kid, and possibly buying a second or third car for the kids to share. Seriously, go talk to your wife, we sure as hell can't tell you whether the dream influenced her or not. Adult up and use your words to investigate and negotiate.

Looks like she is just making that up and using it as an excuse to potentially divorce you. She could have all of that and still be married. I doubt you would stop her from achieving greatness.