She won the European Girls U20 Championship in 1994. Collas played for Bulgaria in the Women's Chess Olympiads of 1994, 1996, 1998, 2000 and 2002. In December 2002, she transferred to the French Chess Federation and since then represents France. In 2003, she won the Mediterranean women's championship in Beirut. In 2007 Collas became the French women's champion after winning a rapidplay playoff with Sophie Milliet. She has played for the French team at the Women's Chess Olympiad since 2004. In the 2012 event Collas won an individual silver medal thanks to her rating performance of 2469 on board 4.
- "C.to Europeo U20 femminile". LOTO - Lost Tournaments. Italian Chess Federation. Retrieved 2017-08-11.
- Player transfers in 2002. FIDE.
- 1st Mediterranean Chess Association Championships. Mediterranean Chess Association.
- "16-year-old Vachier-Lagrave new French Champion". ChessBase. 2007-08-27. Retrieved 12 February 2016.
- "40th Chess Olympiad Istanbul 2012 Women - Board prizes". chess-results.com. Retrieved 2017-08-11.
- Silvia Collas rating card at FIDE
- Silvia (Aleksieva) Collas player profile and games at Chessgames.com
- Silvia Collas chess games at 365Chess.com
- Silvia Aleksieva chess games at 365Chess.com
- Silvia Collas team chess record at Olimpbase.org
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