The three suspects were wearing masks and are believed to have been armed.
The suspects used rental vehicles in the robberies.
Investigators believe the suspects have left the area.
Doors and several jewelry cases were broken.
The suspects stole 'a substantial amount of jewelry' before fleeing the scene.
As part of the plea agreement, she is expected to make full restitution.
The jeweler, age 59, was taken to a local hospital and is expected to survive.
The store owners said the thieves took about $1 million in valuables.
A vigil for Arguello, who was well-known in the community, was held on Saturday.
The robberies and thefts occurred on highways and streets, in parking lots, outside hotels and retail stores and at a gas station.
The communities listed in the alert are Lowell, Tyngsborough, Chelmsford, Dracut, Billerica and Tewksbury.
About $50,000 in custom jewelry was stolen.
The store had recently posted the Patek Philippe timepiece on Instagram.
Police said the suspects wore hoodies and used hammers to smash display cases.
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They hoisted the safe onto a truck and drove away.
The crime happened Sept. 8 at Jewelers On Time.
The workers, who are family members, hit and kicked the suspect and struck him with a stick.
Police are still searching for the four suspects.
It happened Tuesday at Gold Estate Jewelry.
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