If her HDHP health insurance covers only herself, then the maximum that may be contributed for 2017 is $3,400. In order to contribute the family contribution limit of $6,750, you would need to be covered by her HDHP insurance. If you have your own coverage, then you don't qualify for family contribution amounts.
In TurboTax under the HSA section, answer the questions from the owner of the HSA's point of view (your wife's).
IRS Pub 969
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