New restrictions include a daily time limit, nighttime blocks and hidden likes.
A jury found Meta and YouTube liable in a lawsuit that aimed to hold social media platforms responsible for harm to children using their services.
The woman - identified in court as KGM - is the key plaintiff in the case, which alleges she began using social media as young as age 6 and became dependent on the apps.
Adam Mosseri, the head of Meta's Instagram, testified Wednesday during a landmark social media trial that he disagrees with the idea that people can be clinically addicted to social media platforms.
The world's biggest social media companies face several landmark trials this year that seek to hold them responsible for harms to children who use their platforms.
Social media companies have revoked access to about 4.7 million accounts identified as belonging to children in Australia since the country banned use of the platforms by those under 16, officials said.