I feel Amba's plight was downplayed a lot and she was shown more like a revenge seeking woman than someone who just lost her potential husband due to a person and then was rejected by the person who was the cause.
Though I don't know about this part about Mahabharat, after reading the previous posts, I feel this was something which could be shown in a much more effective way. Amba's struggles were never really shown except for when she gets hurt.
But one thing was, she still did have the option to marry Vichitra Veer before he died. She could have married him and then think of taking revenge from Bhishma.
Also, from my point of view, in a Swayamvar, I think the daughter gets married to the most worthy prince and the princesses don't choose. In this case, Ambika and Ambalika should have been the only ones for whom the Swayamvar takes place rather than all three of them so Amba too was at fault here.
Also, Bhishma did put an open challenge, and it was the Prince's choice to accept it. If Bheeshma really did kill him, it was because the Prince and accepted the challenge, not because it was forced.
Based on what I've seen in the show, I felt Amba was seeking revenge for her own satisfaction rather than due to her plight.
Please do not bash as this is just my opinion.