She eventually contacted the Ipswich Borough Council's Rapid Response Team, trying to convince the government that she was being haunted by a nursery rhyme. Though they did confirm that they heard the rhyme too, so good news, she wasn't going crazy! She was probably just being stalked by a supernatural horror.
The team, hopefully armed with iron and salt, tracked the music to a nearby industrial building. The owners explained that the music was a motion-activated security measure meant to scare off thieves, although why they chose a spine-tingling rendition of a nursery rhyme instead of an alarm bell went woefully unexplained. Regardless, the problem was twofold: the volume was cranked up way too loud, and the alarm was being triggered in error by spiders that were skittering across the lens of the security cameras.
So the mystery was solved, and the woman finally got a proper night's sleep. A story's gotta be pretty high on the creepiness scale when everyone breathes a sigh of relief after finding out it was only spiders.