She complimented him, flirted with him, and wished him luck in his Quidditch games.
After a particularly good performance in one of those games, Ron and Lavender ended up kissing.
That same year, when Care of Magical Creatures professor Rubeus Hagrid attempted to see if Blast-Ended Skrewts hibernate (which they do not), she stayed to help collect the runaways instead of fleeing into the hut like the Slytherins, and singed her robes in the process.
Later that year, Barty Crouch Jr, in disguise as Defence Against the Dark Arts professor Alastor Moody, used the Imperius Curse on her in class, thus forcing her to humiliate herself publicly by imitating a squirrel.
This greatly upset Hermione Granger, as she had hoped Ron would attend Professor Slughorn's Christmas party with her and she had expected a more than platonic relationship to develop between them.
It is unclear if Lavender was aware of her room-mate's feelings for Ron, though it seems likely that she would not have gotten involved with Ron if she realised that he was dating her largely to make Hermione jealous.
During this service, Albus Dumbledore took the liberty upon himself to inform the students of Hogwarts that Lord Voldemort was at large once again.
She shared a dormitory with Hermione Granger, Parvati Patil, and other two girls and soon became best friends with Parvati.
However, she did not get along as well with Hermione as she did with the other three girls.
In her final year of schooling, Lavender joined the reconstituted D. to oppose Death Eater control of Hogwarts, and fought in the Battle of Hogwarts, during which she was killed by werewolf Fenrir Greyback.
Lavender was born in 1979 or 1980 to Mr and Mrs Brown, two pure-bloods.