The attacks forced Iraqi forces and the US -led coalition to pull some assets away from the Old City to again clear the Yarmouk and Tanak neighborhoods, which were declared liberated of IS in May.
The historic mosque grounds remain under militant control.
Iraqi authorities and officials from the US-led coalition purportedly fighting Daesh terrorists said the destruction of the site, sometimes referred to as Iraq's Tower of Pisa, is a sign of the extremists' imminent loss of Mosul.
"The victory announcement will come in a very short time", Prime Minister Haider al-Abadi said on his website on Monday evening.
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The Sheriff's Office did not say what the girl was doing and how she ended up hanging from the ride in the first place. The police investigation into the exact circumstances surrounding the fall is continuing.
The attacks also underscore the security threat Daesh will likely pose long after the Takfiri group is routed from all of Mosul and other territories it holds in Iraq.
The army's 16th infantry division seized on Tuesday the al-Mashahda quarter, in the northwestern corner of the Old City, and federal police took al-Bayd and Ras al-Jadda, in the southwestern quarter, military statements said. They are trying to slow the advance of Iraqi forces by laying booby traps and using suicide bombers and snipers. Residents who have escaped from the Old City, say that they have little food, water or medicine in the Old City.
A United States-led worldwide coalition is providing air and ground support in the eight- month-old offensive. Hundreds of civilians fleeing the Old City have been killed in the past three weeks.
A destroyed al-Hadba minaret at Grand al-Nuri Mosque (L) is seen in Mosul, Iraq June 27, 2017. The extremist group is using the civilians as human shields.
Iraqi army soldiers and volunteer fighters from the Popular Mobilization Units, commonly known by their Arabic name, Hashd al-Sha'abi, have made sweeping gains against Daesh since launching the Mosul operation on October 17, 2016.