(Preamble: I recognize "just talk to her" is the default right answer for questions like this, but since the transgression is really small and the player is really new, I'm specifically looking for ways to either communicate indirectly or make a direct communication easy for the player.)
The situation itself is pretty straightforward: I've been running a session for about a year, and two out of four players at the table are completely new to TTRPGs. The game's been going well and people have expressed they're happy with it. However, the problem is that one of the new players tends to talk over people. This is NOT an issue with long monologues - she doesn't hog too much time - but she does interrupt other people's moments with her random ideas.
After some feedback a player just told me this is bugging them. They'd like more space and to not have their moments stepped on. I think they'd be happy if the offending player talked the same amount, but kept their comments for "their turn", i.e. know when to let someone have their moment and when it's okay to speak up with your ideas.
I would not classify the offending player as a Problem Player. She's nice and respectful. Since she's new to the game and just started getting excited about it I want to be sensitive and not single her out or make her feel reprimanded. If she doesn't take the advice then I'm happy to escalate and be confrontational, but for now I'd like a subtle/gentle way to address this. I think maybe she just hasn't considered it's important to give people space to shine when it's their moment - she's excited and having fun and could just use a bit more awareness (I think).
So how can I politely bring this up and help her have a bit more "improv etiquette"?
Edit: Emphasis on the "subtle/gentle" part. I'd like help thinking of indirect ways to bring it up. Or, if "just talk to her" is the only way, how to make that conversation less personal and easier for her. I want to err on the side of changing the behaviour without making her feel like she's done something wrong, if possible.