Qualitative presentation invites a mass (qualitative) interpretation. Instance interpretation needs an instance presentation. Either way, both presentations and readings are acceptable as long as both follow an established linguistic convention , and are not a result of a random whim by the speaker.
Here,
Miscarriage, in her case, could be disastrous to her.
or
A miscarriage, in her case, could be disastrous to her
Both are correct, but in either of them
miscarriage addresses a different mental domain within which
miscarriage can be found. Just think about it.