The Lady Glovers made a promising start against Aston Villa as Heatherson headed a Helen Bleazard free-kick wide inside the opening minute.
Yeovil continued to dominate the proceedings and broke the deadlock on 17 minutes when Alys Hinchcliffe latched onto a through ball from Shauna Cossens before rounding Villa keeper Caitlin Leach and firing home.
In the 25th minute, Jodi Cornwall tested Leach with a powerful long range strike that the Villa keeper turned onto the bar before gathering at the second attempt.
The visitors equalised four minutes later though when Olivia Fergusson cut through the Yeovil defence before slotting past Yeovil keeper Charlotte Haynes.
On the stroke of half-time, Hinchcliffe raced through on goal before her eventual effort was turned behind for a corner by Leach.
Six minutes after the re-start, Fergusson threatened again for the visitors, but Yeovil keeper Haynes raced off her line to clear the danger.
In the 70th minute, substitute Sarah Wiltshire attempted to lob Leach from 35-yards, but her effort narrowly cleared the cross bar.
The Lady Glovers regained the lead on 76 minutes when Cousins headed home a corner from Bleazard and in the 90th minute Heatherson scored Yeovil’s third to add gloss to their win.
Yeovil Town Ladies: Charlotte Haynes; Sammy Quayle, Ebony Dover (Ellie Curson 82), Helen Bleazard, Corinne Yorston; Natalie Haigh; Alys Hinchcliffe (Sarah Wiltshire 62), Emily Donovan, Shauna Cossens, Jodi Cornwall (Nicola Cousins 62); Annie Heatherson
Subs not used: Stephanie Williams, Stacey Pearson, Natasha Knapman, Alice Evans
Red Cards: None
Aston Villa Ladies: Caitlin Leach, Hayley Crackle, Elisha N’Dow, Lauren Haynes, Hannah George (Maddy Cusack 39); Abbeyleigh Stringer (Alicia Robinson 71), Sherry McCue, Georgie Griffiths (Lucy Porter 77); Bethan Merrick, Olivia Fergusson, Katie Wilkinson
Subs not used: Amy West, Jess Myers, Laura Cooper, Mollie Rouse
Red Cards: None
Referee: Alistair Francis
Yeovil Town Ladies face Aston Villa Ladies again next Sunday (2.00pm KO), but this time in the FA Women's Super League, hoping for 3 points to chase down Reading Women and Doncaster Rovers Belles. Buy your tickets here.