Lost all taste for salt... meaning she doesn't like salt, or she can't taste salt?
For years, I preferred much less salt than most people, now I salt things fairly heavily. I think both are swings in the state of my adrenals, I just missed it for those 15 years at first. I think my adrenals are more rundown now.
Pregnancy is a fairly big strain on our adrenals--healthy people can deal with it well, but people who are stressed (physical stresses or mental/emotional or both) can find it takes quite a toll--it seems to push women over the edge quite often, and more health issues crop up afterward.
ETA: It seems to correspond to imbalances in how we regulate sodium and potassium, and at times we either hoard sodium and waste potassium (earlier on), or later our bodies hoard potassium and waste sodium (some people feel bad eating lots of bananas and potatoes because they have so much potassium and they just don't tolerate it well, and they salt things heavily because their bodies are using the sodium very inefficiently).