She is the best of the bunch besides Thanos, so she is definitely worth it. The others not so much, unless you're going to be pushing for Thanos.
If that's the only pieces you need, maybe go for it. She is a fine champion but not usable really in BGs. She'd be another body in your monthly EQ elder difficutly completion maybe.
I just bought today 1 piece of D.Vision , as I want to start building them for Deathless Thanos and he is getting buffed next year. It's a long run for him, maybe will get him in 2 years xD
nah, spend it on rank up mats.
Not worth it for your situation