The phrase "a signal of her" is correct and usable in written English.
It can be used to indicate a sign or indication related to a female subject, often in contexts discussing emotions, behaviors, or characteristics.
Example: "The way she smiled was a signal of her happiness."
Alternatives: "an indication of her" or "a sign of her".
It was her style, but also a signal of her seriousness, her not-gameness.
She is not brave; she is reckless, a signal of her resignation.
He called Clinton the "safe haven" for the Democratic party, but said speculation that other candidates were actively considering a campaign was a signal of her potential vulnerability.
Camille made her way in life as a courtesan, and her byname referred to the camellias she carried as a signal of her availability.
As a careful writer, not given to wasting words herself, Justice Ginsburg appeared to be sending a signal of her dismay at Justice Stevens's failure to join her in dissent this time.
Brown, Shahian and Garvey wore gold pins similar to one that Nicole Simpson enjoyed, a signal of their loyalty to her.
Ms. Palin's appearance at the Tea Party convention was closely watched as a potential signal of her political future and the extent to which the convention would embrace her.
Her appointment as defense minister in January 1993 was seen as a signal of Mulroney's confidence in her political future, especially when he announced his own retirement shortly thereafter.
After dinner he presented her with three roses — red, white and yellow — because "roses are a signal of love from me to her," he said.
"The shockingly harsh sentence against her is a signal of just how unnerved the Iranian authorities have become," Kumi Naidoo, the secretary general of Amnesty International, told me.
From Williams it was a signal of intent, as she belted out her service game to love and then returned to break Kvitova, who let out a yelp and launched a spare service ball into the air in frustration.
