Found this interesting even if not directly a possibility in this case, but just in case- does the bathroom at the park have special garbage cans for feminine products?
If so, were they checked? complete speculation, imo. fwiw
July 28 2021
Did a suspect hide blood evidence in plain sight?
''It's a fact. Many people are squeamish when it comes to talking about bodily functions like a woman's monthly
menstruation. So, did a young suspect take advantage of that discomfort to get away with two murders? Did she clean up a blood trail and place the evidence out in the open, knowing that male investigators wouldn't take a closer look? That could explain why a case that took place more than a century ago continues to baffle crime experts to this day.''
''The circumstantial evidence pointed to Lizzie. And yet, where was the blood? Investigators were stumped by a lack of blood evidence linking Lizzie to the murders. Abby Borden, who was murdered first in an upstairs bedroom, had been struck as many as 19 times. Andrew, struck while sleeping on a couch, was hit multiple times in the head. If Lizzie was the killer, wouldn't she be covered in blood spatter? Wouldn't she have left a trail of blood?''