Thanks for posting your query.
It could be Vaginismus
A condition of involuntary tightness of pelvic floor
muscles on attempting intercourse.
Yours would be secondary vaginismus since you already have a kid.
Causes of secondary Vaginismus are Traumatic event, child birth, surgery, Vaginal infection
So treatment would focus on the cause.
It is treatable in all the ways.
Hope I have answered your query.
Wishing you good health.