Is it obligatory for a woman to distinguish her nails from a man's nails?
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Question : This is Umm Abdullah saying: Is it obligatory for a woman to distinguish her nails from a man's nails, whether with henna or otherwise? So that she does not become one of those who imitate men?
Answer : The answer is: It is not obligatory. And no, we said that changing one's appearance is also disliked, changing one's face. O Umm Abdullah, do not be excessive in imitating [men]. A woman is like a multiple of a man; do not leave [her nails] for more than forty days. And do not do what the foolish women do, who leave the nail of the little finger long and shorten the rest, for this is contrary to the Sunnah without doubt. It contains a doubtful matter.
Answer : The answer is: It is not obligatory. And no, we said that changing one's appearance is also disliked, changing one's face. O Umm Abdullah, do not be excessive in imitating [men]. A woman is like a multiple of a man; do not leave [her nails] for more than forty days. And do not do what the foolish women do, who leave the nail of the little finger long and shorten the rest, for this is contrary to the Sunnah without doubt. It contains a doubtful matter.
Source
الفتاوى الثلاثية (1) - 2 — binothaimeen.net (25:02)
The Arabic text is a machine transcription of the audio recording.