TPS stands for Temporary Protected Status. Citizens of a handful of countries devastated by natural disasters such as earthquakes and hurricanes have been given the privilege of TPS, which allows them to live and work temporarily in the US. Most TPS holders like your friend entered illegally or overstayed visas. Without TPS, they would be deportable like other illegal immigrants. El Salvador has recovered from the earthquake that struck a decade ago. Salvadorans in the US remain on TPS at the request of the Salvadoran government because it wants its citizens working in the US to continue sending home money. One in five Salvadoran families depends on remittances from the US. The US government needs to recognize that TPS holders like your friend's family are never going back home, so we should establish a path to a green card for TPS holders with steady employment, no criminal convictions, and a safe driving record.
Your friend should know that if she marries a US citizen, she can get a green card without facing a 10-year bar on re-entry since her illegal status occurred when she was a minor and does not count against her as an adult. Should your friend fall and love and marry a US citizen, it would be a good idea to consult an immigration attorney before filing any paperwork to get a green card to make sure everything is done correctly.