Well, traditionally things like Gold and commodities and raw materials like oil, metals and agricultural products are used as a Hedge against inflation, because they retain their value in unstable conditions, but Bitcoin has shown that it can do that over longer periods.
During deflation, Cash becomes the most valuable asset because it can buy more.... and Bitcoin can both be a Commodity and a currency, so I guess she is correct.. if she says Bitcoin can be used to counter both.
Yeah, you are right. This is essentially the reverse of Gresham's law. Good money (aka bitcoin and other things backed by assets) will eventually drive out bad. People won't accept anything for the long term that is going to be inflated away. Not to mention all the other benefits of bitcoin.
Eventually people will realize that fiat not backed by anything is worth less (and eventually worthless) in the long term. In the short term politicians can get away with devaluing a currency but reality catches up with their shenanigans eventually. It is only a question of when. An asset/currency/token/etc such as bitcoin illustrates the costs of holding fiat for the long term and helps expose that the emperor has no clothes.