Bashor has pleaded not guilty to the misdemeanor in November. The first student claimed Bashor sexually harassed and groped her on several occasions in 2016.
Prosecutors say the new charge stems from inappropriate contact that spanned from the summer of 2014 to early 2017. The girl reported contact that escalated from hugging to groping.
The Frenchtown School District placed Bashor on paid leave following the initial charge.
A phone number for Bashor could not be found Thursday night.