In Ibsen's Hedda Gabler, why did Hedda burn the manuscript?

Henrik Ibsen's Hedda Gabler tells the
story of a woman whose character traits alone can create a story of their very own.
Hedda embodies every negative characteristic that a woman could possess. She is
ill-mannered, cold-hearted, easily-annoyed, and ungrateful. She is also jealous,
cunning, and dishonest. This reveals the real nature of a woman so empty inside, and so
shallow at the same time, that her own inner misery is consistently in search of
company.

All these descriptors easily lead us to conclude
that Hedda may or may have not had a real good reason to burn Lovborg's manuscript: She
may have simply done it as yet another manifestation of how worthless and cruel her
behavior can be.

We do know, from the story, that Hedda
confesses to her husband how the reason why she burned the manuscript was supposedly  to
help him in his competition against Loveborg for an academic position. According to her,
if Lovborg's manuscript is out of the way, then the competition will be more favorable
for her husband.

Yet, having described Hedda, we find that
it is hard to believe that she would sacrifice anything for anyone. She is first,
second, and third in her view. Therefore, the best assumption is that Hedda burned
Lovborg's manuscript because her own state of miserable and eternal frustration always
leads her to wish the worst on anyone who would desire a better life. After
all,

a) She is jealous that Lovborg befriended
Thea

b) She is indeed jealous of Lovborg's talent over her
boring husband's

c) She demonstrates a psychologically
unfit apathy for bonding with people.

d) She is just plain
mean.

All this being said, Hedda shows us that her
destructive tendencies leave desolation, sadness, and even death, across her path. Hedda
is not a woman to meddle with. She is indeed capable of
anything.