Alexis Lannon is accused of grabbing a police officer's gun while in the emergency room.
She now is charged with criminal threatening with a dangerous weapon.
Lannon also made headlines in 2015 after she was spotted walking down Route 2 in Carmel with a homemade weapon.
Police said she was destroying property and ended up getting shot by a Penobscot County sheriff's deputy after approaching in a threatening matter.
She was found incompetent to stand trial in that case.
Lannon was expected to appear in a Bangor courtroom Monday afternoon to answer to the latest charge.