"Had Ishaani known about the situation before, she wouldn't have felt so heart broken"
Works (slight modification, "wouldn't" has an apostrophe, it's a conjunction of "would" and "not")
"was Inshani been informed before, She wouldn't have felt so heart broken.
Doesn't really work, and will likely confuse who hears it. "Was [noun] been" is not a pattern generally used in English. The following
The following also work:
"If Inshani had been informed before, She wouldn't have had felt so heart broken.
"Had Inshani been informed, she wouldn't have been heartbroken."
For this last one, "before" isn't needed, since informed, had, and been are all past tense, implying it as a before event. Further, since heartbroken is exclusively a feeling, saying she felt it is a little redundant.
"Inshani wouldn't have been heartbroken if she had known."
This one technically flows as one thought instead of a first thought and following thought