"alert her" is a correct and usable phrase in written English.
It means to notify or inform someone about something. Example: "Please alert her about the meeting at 3 pm today."
I alert her to WikiFeet, a site that collates pictures of famous feet – hers are awarded an impressive four-star rating.
We didn't want to alert her that we were there".
In his final moments alive, Lloyd texted his sister to alert her.
She recalls taking notes for her friend and frantically phoning her to alert her to exams.
A Dutch spy in the Gestapo headquarters would sometimes alert her to an impending raid.
It irked her that he had let this happen without making any sound to alert her to the problem.
Among others, she has a Gilt Groupe app set to alert her via text message for deals.
She went downstairs to alert her neighbor in the apartment below and found smoke billowing outside the unit.
Fans of the show who heard about the house often alert her to available Munsters-worthy items.
If Allen was simply hoping to alert her followers to a recent book discovery, it was a misfire.
But she says this didn't alert her to the nefarious nature of his business activities - 'He was a company director.
