No, Ida was a primitive primate, not the forerunner of all mammals.
She may have been the forerunner or related to the forerunner of later primates.
I know Ida quite well from reading a horribly overblown book about her written by some hack journalist whose knowledge of evolution was obviously superficial. I don't recommend it...cannot even remember its name. Maybe "The Missing Link" or some such.
Yes, primate. I don't know where my brain was when I wrote that. Obviously mammals have been around a LOT longer than that.