After a government lab accidentally unleashes an experimental virus, a suburban mom must struggle against her timid nature and a horde of mutated neighbors as she races to rescue her kids from certain death.
This sounds like a zombie cross family drama movie. When dealing with genre movies best to specify this, you can’t describe a zombie movie and expect people no to pick up on it. So if you are writing a zombie movie embrace and celebrate it by outright declaring what it is.
The zombie genre has been done to death (pardon the pun…) so I suppose a fresh take via a not yet seen genre cross over could work.
Only things that really jump out as problems are a logic flaw and character descriptions.
“…a suburban mom must struggle against her timid nature…” is a longer way of saying – timid mother, so best to employ more economy in the character description, in that sense brevity = impact.
Secondly after she gets her kids, then what? Where will they go for safety? How will they fend off the zombies? The concept reads like act 1 and half of act 2 but lacks the climax which according to the genre needs to be the MC’s reaching a safe haven so best to add in a description of the final safe place they will go to.
Hope this helps.