It sounds like a title to a show, movie or video game (most likely a cartoon)
Translation: Barbie in a mermaid adventure or Barbie's mermaid adventure (sounds better)
"Una vela" is a candle.
"Una cuadernos" is not grammatically correct in Spanish. "Una cuaderno" would mean "a notebook" in English.
A girl and a rat.
Una carpels in English
Una casa means "a house"
The latin term "Una We Possum", means "Together We Can"!!!! Una We Possum = Together We Can
"Una semana" means ' One week'.
Una bolsa is spanish for "a bag"
Una mano is Spanish for 'a hand'
mandame una foto
It can mean "a" or "an", depending on context. It can also mean "one" describing a feminine noun. Example: Tengo una manzana. "I have an apple". Tú tienes una mesa. "You have a table". Yo tengo una. (referring to the table) "I have one".
"Una botella" means "on bottle" in English.