If she slipped to your boss, this could be a bigger deal than if she told a buddy from a different team.
Let’s assume it was your boss. Will news about your dissatisfaction be a surprise? If so, the lack of communication between you is its own problem, and this disclosure could present an opportunity for them to address your concerns if they are so inclined.
If you have been transparent about your concerns, this shouldn’t have come as a shock. You could try positioning your actions as succession planning to ensure team stability whenever the time would come for a change.
Realistically, this could affect how you are perceived at the company. You may be seen as a lame duck with less influence and authority because of the clear signal that you are on your way out.
It should also amp up the urgency you bring to your job search.
It’s a bit of a trope, but set yourself up to choose what you are going toward rather than just running away. That will help you avoid repeating this situation in the future.