And yet, it didn't stop her from abandoning them. She still stormed off into the void, leaving them to their fate.
Her anger there could also be taken another way. Sylvanas had always taken pride in her "warrior's heart," so her seething in that sequence could very well be coming from her wounded pride at seeing a group that she thought she had crafted into perfect weapons reduced to shambles.
I still interpret from that story that she only sees the Forsaken as a means to an end, and not as "her people."