Yes, it is allowed provided no non mehram sees you.

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This is not permissible. Kindly refer to the following links https://www.youtube.com/watch?v=8YZhtWrbIUQ Praise be to Allaah. Women are forbidden to add extensions to their hair, whether they are made of hair or anything else, if they could be mistaken for hair, because of the reports that have been narrated concerning that. Fataawa al-Lajnah al-Daa’imah, 5/193

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No problem in going to a place where no non mehram sees you and getting it done by a lady providing you don’t expose any awrah.

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