She was taken into custody at the courthouse. The infant was turned over to a family member.
An attorney for Jones said she was trying to break up the confrontation and was actually trying to pull her boyfriend away.
Machera set bail for Jones at $5,000.
Both are due back in court next month for a probable cause hearing.
Courts reporter Julie Manganis can be reached at 978-338-2521, via email at firstname.lastname@example.org or on Twitter @SNJulieManganis.