We learn that Tacey is serving a five year sentence and that she gets out when shes 20 years and 4 months. She doesnt know if shes sorry or not about what she did she also doesnt know why she did it.

We learn that Mandy considers to stop writing because shes not sure that a real friend would ignore it when she talks about such big problems as her brother Steve.

Tracey feels that shes missing out on her best years while shes looked up in prison.

Mandy feels that shes becoming a darker and more depressed person after reading Tracys letters.

Mandy is scared that Tracys one day will show up on her doorstep full of tattoes and piercings and expect to stay there.

In this part i think that Tracys is using a softer approach than earlier. I think that she started to open up a bit. 

Their relationship is built over time as they start trusting each other a bit more.