Run the cable to the PIR connector then a second cable from the same connector to the LED at the front. From that connector run a third cable to the LED at the side.
Option 1 then. She will get a letter, a router and a transfer date. They have a vulnerable people help line. My 90 year old father in law was swapped from PN to EE last week. Very straightforward process.
1. Accept the transfer to EE
2. VOIP
3. Forget landline and go 100% mobile
In a few years having a phone tied to a building rather than an individual will be as quaint as a red telephone box.