If both are on different locations then the options for you are the ff:

You can subscribe to QuickBooks Online to access the company file any time, anywhere.

Second, would be hosting wherein you will be able to have full access of your QB […]

Resolution for 'bookeeping issue: 'How can 2 people use quickbooks? i do the bookeeping she does the invoices different internet connections.' available: Yes.

The bookeeping 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 bookeeping issue yourself by looking for a resolution described in the article. If it is a complex bookeeping issue or you are unable to solve the issue, you may contact us by clicking here or by using other bookeeping support options.

For more information about resolving issues related to bookeeping in Quickbooks/QBO or to get support for the issue 'How can 2 people use quickbooks? i do the bookeeping she does the invoices different internet connections.', click the link below: