She signed with Warner Bros. Records following the end of Lizzie McGuire and released one studio album and one extended play, both of which saw little commercial success.
She spent most of her early years in Burbank and Sherman Oaks, California, then joined the Broadway National Touring cast of Les Misérables as Little Cosette.
[2] Her acting career began when she was cast in the Broadway production of Les Misérables in the roles of Young Cosette and Eponine.
In 2000, she was cast as Miranda Sanchez on the Disney Channel teen sitcom Lizzie McGuire, alongside Hilary Duff.
Lalaine portrayed Chloe, a young Slayer-In-Training who dies by suicide, on the television series Buffy the Vampire Slayer.
Lalaine and former All That star Lori Beth Denberg co-starred in the web series Raymond and Lane.
[11] Lalaine wrote six songs on the album, including "Life Is Good", "Can't Stop", and "Save Myself".
The following year, she released a single, "I'm Not Your Girl" and remade the song "Cruella DeVil" for the albums DisneyMania 3 and Disneyremixmania.
In 2004, Lalaine sang "If You Wanna Rock" on the soundtrack for the Disney Channel Original Movie Pixel Perfect.