Answer:
She lost her identity card (carnet de identidad)
Explanation:
In this extract, we can see that Lourdes and her mother are at the airport traveling to Lima. Lourdes cannot find her identity card, which is expressed through a question to her mother "Mamá, ¿sabes dónde está mi carnet de identidad?" (Mom, do you know where my identity card/ID card is?). And she finally finds it in her purse "Ya lo encontré en mi bolsa".
The carnet de identidad, also called documento nacional de identidad (DNI) is an official document or card with your name, date of birth, photograph, or other information on it that proves who you are . In other words, it is Lourdes' identification; that is the reason why she needs her card to travel to Lima.
