The fact that you left the plant attached to the roots means it was ripening as long it was still alive, and all that time the THC was degrading into CBN. Also, time alone with degrade the THC to CBN, and light helps it along.
CBN alone is a sedating cannabinoid, responsible for couch lock and body stone. Many folks here will let their plants ripen further if they are looking for sleep meds, and one grower used to punish his plants at the end with drought and late harvest to make potent oils for sleeping.
If you're making CBN capsules from that, keep in mind that it still needs to be decarbed first, and that your mom will probably feel what she considers "high." If she's dead set against that I would go with 13g13's suggestion, or another member here who would make CBD/melatonin gummies as sleep meds for his wife.