The major Asian bird flu epidemic was ~2005, after it was already brought to market.
Tamiflu isn't a "cure", the effects are pretty limited, but it's used because we have nothing else.
Tamiflu has been wildly successful product for Roche, why would they not develop it and instead try to treat "symptoms"?
Tamiflu is not in short supply by any means, Roche produces huge stockpiles for the US gov't and the shelf life is pretty long. There is plenty to go around.
To summarize, your ex-gf's story sounds like a could-be-true story (for those who don't know better) that plays to the typical stereotypes for "big pharma".
I'll also add that the cost to treat someone with Tamiflu before it went generic was ~$100. Pretty reasonable considering what drug costs are like in general.