Block her number for calls and limit yourself to checking texts/emails from her to once per day. If your husband agrees, you could set up a mailbox rule to forward her emails to him before deleting them, or before marking them read and archiving them, so you don't see them. He could then tell you if it's something that actually requires your attention.

She will absolutely do an extinction burst when she realizes that you are not being responsive. Do your best to hold firm.

If you feel the need to talk on the phone with her, do it on a schedule at a time you set (you make the call to her), and stick to your plan of excusing yourself from the call if she brings up travel or how you're being a terrible daughter. "Oops, got to go de-wax the cat! Love you! Bye!"