She plays Centre for Italy internationally and for Valsugana Rugby Padova at club level.

Sillari made her test debut for Italy against England on 12 February in Recco in the 2012 Women's Six Nations Championship.

In 2016 she joined Aylesford Bulls, who later merged with Harlequins in 2017, and went on to win the 2016–17 Women's Premiership season.

On 23 April 2022, Sillari was named Player of the Match in Italy's Six Nations win over Scotland, she scored ten of her side's 20 points.

[1] On 9 September, leading up to the Rugby World Cup, Sillari scored a try in her side's 26–19 victory over France in a warm-up match.