You want a definite answer for a hypothetical situation?! Now THAT is funny, LOL.
"Because that's where she was working...120 miles from home"
Uh, that's what I said. You get no points for repetition. You appeal to being practical however. Practical would either move to London, or find a job in Bristol.
London to Bristol by Train
There are frequent trains to Bristol Temple Meads from Paddington Station. The journey takes just under and 1hr 45min. Advance round trip fares start at £20.00.
A yearly season ticket which allows travel to and from London & Bristol cost approximately 20 pounds per day.