One did mention that a previous stillborn in the group was snatched by a higher ranking female and destroyed shall we say. As I say this was a conversation between a keeper and another staff member that I overheard so perhaps take it with a pinch of salt.
That sounds like a common occurrence. At Taronga Zoo, a female gave birth to a stillborn infant and Mary (a high ranking female) snatched it from her and cannibalised it.
In 2005, a high ranking female named Shiba was seen carrying the deceased infant of her rival. It’s unknown whether the infant was stillborn or killed by either Shiba or it’s grandmother (who had a habit of doing so).
Chimpanzees certainly live a complex life ranging from tender care to extreme violence, but it’s what makes them so fascinating. A large community of chimps is a species I could literally spend hours watching.