QB Issue Resolution:

Delete the invite and reinvite her.  She may have more than one log in.  This way she can add your company to the login she normally uses.

Resolution for Issue 'I sent my accountant an invite as an accountant to my companies files for QuickBooks Online. When she received the invite and created a login it took her to a blank file' available: Yes (Solved).
Source: Intuit Community forum.

I sent my accountant an invite as an accountant to my companies files for QuickBooks Online. When she received the invite and created a login it took her to a blank file: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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