employee to peer issues

Sucession planning is always a necessary, so I Worked with an associate to take over my position someday. With the needs of the company beeing what they are, she got promoted very quickly and we are now peers. Not a problem on my side, I was proud of her. Now the problem is, she has never been at this level before and dosn’t seem to know how to act. She wants to be everyones friend at the expense of other employees. I tried to let her know the effects of what she was doing but now as I am a peer my advice is “telling her what to do” and seen as me trying to continue being her boss. Should I let het fall on her own, follow behind her and fix, or keep trying to get through to her?