[1] She is a multiple-time Lithuanian champion and a five-time national record holder for both the freestyle and medley relay events.

Mileisyte qualified for the women's 50 m freestyle at the 2008 Summer Olympics in Beijing, by clearing a FINA B-standard entry time of 26.32 in a time trial from the Seven Hill Trophy in Rome, Italy.

Mileisyte failed to advance into the semifinals, as she matched her thirty-ninth-place tie with two-time Olympian and South Carolina Gamecocks swimmer Sharntelle McLean of Trinidad and Tobago in the preliminary heats.

[4] At the 2009 FINA World Championships in Rome, Italy, Mileisyte helped out her team to set two Lithuanian records in the preliminary heats of both freestyle and medley relays, clocking at 3:54.97 and 4:12.30, respectively.

She is currently working as an intern, along with Binevicius, for the swimming team at Plymouth College in England.