Jaquenetta's gravestone does not exist within Veronaville, so she can't be made playable without the use of hacks. As a result, the only indication of Jaquenetta's existence is provided by the family tree of her descendants. According to her SimDNA in SimPE, her hair was black before it turned grey.
Jaquenetta has no memories of her husband, and although she has the memory of doing WooHoo with Mystery Sim, she doesn't have the memory of Holofernes' birth. So basically apart from the WooHoo memory, she only has Create a Sim memories. Jaquenetta has no skill points or personality points, and if she is resurrected with hacks, she will have a random set of interests.
Resurrection tip
This Sim has no character data and cannot be resurrected in-game. For more information, read this guide.