Because both Prue and her sisters need to move on and that's not going to happen if they still see each other.
In the first three seasons it is Prue but after she dies Piper becomes the best. But if Prue and Piper battled Prue would win cause Pipers freezing and maybe her blow up power dont work on other good witches
prue halliwell
Prue is the eldest, then piper, then Phoebe. Prue dies at the end of series 3, then Paige comes in as the youngest for seasons 4-8
Well Shax killed Prue and Piper but Piper came back alive and Piper tried to bring Prue back to life but it did not work.
false Piper, Phoebe and Prue. Paige came later instead of Prue
Sadly no, once Prue dies she never comes back.
Prue died by Shaks, The Source's assassin. He through Prue and Piper through a wall Leo was in the underworld with Phoebe and when he got back he healed Piper first and it was too late to heal Prue.
The specifics are unknown, but it is believed that Prue (Dorthey) took Piper's place as she died at the end of season 3, but Prue traded her life for Piper's.
Phoebe, Paige, Prue and Piper
Prue dies in Season 3 Episode 22- All Hell Breaks Loose!!
Yes My Favorite Show A New Destiny Without Piper I Don't like Piper Married Leo Don't like I Want Prue Married Leo Prue Need To Stay Save Phoebe And Pagie New Charmed Ones Prue,Phoebe And Pagie Stay Away Demon Please Stay Alive Yes let Prue Go Out First Date With Leo
Prue dies at the end of the 3rd season of Charmed.