You are confusing using an online software account to prepare a tax return with the actual results of the tax return that was prepared. The software account you used does not determine who "owes" the tax.
When you file jointly your debts are also shared -- you can look at your online accounts with the IRS to see what is shown there. If you filed a joint tax return, "she" does not owe----you owe the tax due as a married couple. You both owe the tax due on a joint return. The tax due is on line 37 of the Form 1040.
You will each have an IRS online account.
https://www.irs.gov/payments/your-online-account
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