The Chippenham-based runner clocked a time of 77mins 54secs to carve one minute six seconds off her previous best to finish third in the Maidenhead half marathon on Sunday.
“It is so nice to finally run a PB,” said Bell.
“I am training for a marathon so I felt very strong and on a good course with a strong field the race went very well for me. I am very happy.”
Bell’s previous best was set in the Paddock Wood race in April while a year ago her best was 79:31 so her progress has been impressive and that means her 2018 marathon PB of 2:44.56 could also be under threat.
“I have entered the Warsaw marathon on the same day as Berlin which could be a bit hit or miss as I don’t know much about the course but hopefully it will be okay,” added Bell.
The three women ahead of Bell in the South West Rankings are all members of Bristol & West AC; Kate Reed leads the way with her PB of 72:44 set when winning the Bath half followed by Jenny Spink (75:24) and Charlotte Taylor-Green (75:46).