SAN DIEGO - Two teen girls trying to sneak out of an apartment window were injured in a three-story fall in the Point Loma Heights area early Thursday morning.

The fall occurred at around 2 a.m. at an apartment complex in the 4000 block of Temecula Street.

According to San Diego police, the two friends -- ages 18 and 17 -- were trying to sneak out after the mother of one of the teens forbade them from going out.

The girls used bedsheets to form a makeshift rope. Then, one-by-one, they each tried to scale the side of the building. The first girl fell about 15 feet to the ground and the second fell about 30 feet.

Police were called to the scene, and the two were taken by ambulance to nearby hospitals.

Rebecca Tassoni said she and her daughter argued about curfew. She said she was shocked to find out why her daughter and her friend were trying to sneak out.

After the argument, Tassoni said her daughter "went into her room and I thought that was the end of it."

However, a short time later, Tassoni saw her daughter's friend on the ground "with both of her ankles broken."

"A broken foot or ankle … probably the least bad things that could have happened from an almost three-story fall," said Tassoni.

Tassoni confronted her daughter to find out why she wasn't acting like herself.

"She was like, 'I took a Xanax.' She just seemed lethargic and just kind of slow-talking, and she just looked like she was going to fall asleep at any time," Tassoni told 10News.

Tassoni believes Xanax has become a problem among teens in Ocean Beach. She said she is scared some dealers are lacing the pill.

"If the pill says Xanax, it's one that somebody has pressed [and] made to sell on the street," said Tassoni.

Tassoni hopes her daughter's mistake can help start a conversation among parents and their kids.

"All you can do is encourage them to make good choices. You don't want to be sitting in the ER watching them be popped together. It's a little better to have the conversation before it gets to that point," Tassoni said.

Tassoni's daughter broke her foot in the fall. The other teen broke both of her ankles.