Jenna is Toby's step sister in pretty little liars. She got blind after Alison threw the stink bomb into the house,unaware of someone being in it.
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Lucas has mud on his shoes in "Pretty Little Liars" because he was helping Hanna cover up the accidental blinding of Jenna with a stink bomb. This led to him being in the woods and getting mud on his shoes.
billy is blamed for being jennas killer but ali the real ali killed jenna because ali thought jenna knew too much about her killing courney ( her twin)
Jenna Cavanaugh was blinded after being hit in the face by a firework. Her brother, Toby, took the blame but everything but Jenna getting hurt had been set up by Jenna and Courtney. Courtney claims to have misaimed when she was caught by surprise to see Toby abusing (touching) Jenna. Jenna Cavanaugh was later killed by Alison.
A wrote in jungle red lipstick color (Alison's shade which is later found being woren but Jenna) And it said: It wont be that easy to get rid of me - A
She realizes that she should help the Liars, not go against them.
Alison DiLaurentis accidentally blinded Jenny and found out that her and her step-brother were doing it regardless of being step-siblings. Later the real Alison DiLaurentis kills Jenna for knowing too much about the Alison/Courtney switch. See Wikipedia for more
Well in the novel there not really friends but both have or in Ali's case had family problems, so Ali agreed to help Jenna with the Toby situation.
Because Mona was A!
She was obsessed with being ali and tried to kill her.
Jenna is such a threat because she knows about Alison not being dead and hiding out in room 214 , which is the code that Toby found written down in Jennas room that he gave to Spencer. Jenna also knows stuff about the girls that Ali told her.