彼女の髪は白髪まじりだ。

English Translation

Her hair is streaked with gray.

searching “白髪” on jisho will show the word “白髪交じり”, pronouncing “白髪” as “しらが”

@ErisCeos
Good catch! しらがまじり is the correct pronunciation in this particular sentence structure.

However, if you replace 彼女の髪は白髪まじりだ with 彼女の髪には白髪まじっている, some native speakers may pronounce はくはつ/が/まじっている though I personally prefer しらが/が/まじっている.

Also, 白髪の女性が椅子に座っている (meaning: A lady with grey hair is sitting on a chair) is pronounced as はくはつ. Note that I intentionally dropped まじり.

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