But the White House is urging her to ignore the subpoena. And since, in the words of Taylor's lawyer, the president is "a person whom [Taylor] admires and for whom she has worked tirelessly for years", she doesn't want to testify and thinks she shouldn't have to.
Pleading the fifth is on the books. Various privileges, though most are bogus, can be asserted and litigated. But being a member of the Bush personality cult just isn't a reason to refuse to testify.
Right. There may be some imagined if probably bogus privilege the Bushies can try to claim. They could use that claim to try to block her from testifying by going through the courts. But there's no "I want to testify but I can't because they're telling me not to" rule that makes any sense.