Yes ek baar usne Jodha se kaha tha (indirectly) that she want her own child as Rahim is her step-son... But I dont think that FOR MAKING RAHIM THE FUTURE KING Salima can do this chip things...
I am saying this not bcoz she is friendly with Jodha...but Salima knows that Jalal respects her and she also knows that Her and Jalal's child at this stage is impossible... And Jalal have many wives any wife can give him child so she cant kill child every time... Secondly Maham and Adham... On day of celebration Adham said to Maham that She Loves Jalal More than Him..and he wants to bcom the king and after hearing this Maham was crying like ok i will make u king... so she can be the culprit... and the other women from Haram can do such a chip thing too!
I was thinking Minaz begam can do this (that catty eye lady... )when Old Ruqs slapped her she took the pran that one day Jalal will come to her leaving Ruqs alone... although she is not there after bairm's death but still she can be the culprit...