At the French Nationals in May 2018, Bossu competed only on uneven bars, winning silver in the event final.

In September, she competed at the Paris World Cup, winning the gold medal on the uneven bars.

She was named to the French team for the World Artistic Gymnastics Championships in Doha, Qatar in late October.

She again only competed on uneven bars and contributed to France's fifth-place finish in the team final.

[3] After Doha, she competed at the Cottbus World Cup in Germany in November, but didn't make the event finals.