One of her best-known poems is Några ord till min kära dotter, ifall jag hade någon ("Advice to my dear daughter, if I had one").

She also wrote on Sweden's class system in the satirical poems against snobbery Hans nåds morgonsömn ("His Grace's morning snooze") and Grevinnans besök ("The Countess's visit").

[1] In her social views, she felt sympathy for the working classes, opposed the privileges of the nobility and acted as a spokesperson for the "third estate", idealizing a simple and humble life style.

[1] Lenngren enjoyed great success: already in 1774, she was inducted into a literary society in Uppsala, earned good reviews and poetic tributes in the press, became known as a defender of intellectual women, and referred to herself as a "litterata".

[1] After her marriage, she hosted a literary salon, which became a center of cultural debate frequented by Gustaf af Leopold, Nils von Rosenstein, Frans Michael Franzén and Gudmund Jöran Adlerbeth.

In 1797 the daughter was placed in a mental asylum, but died soon after her admission, an event which affected Lenngren deeply, as did the death of her father, who drowned under suspicious circumstances in 1798.

She declined their admiration with the poem Dröm ("Dream"), in which she described how the poet Hedvig Charlotta Nordenflycht had appeared to her and deemed her unworthy.

Anna Maria Lenngren debuted as a writer of poems for funerals and weddings, and her earliest work has a tone of the ecstatic passion common in the religious circles of her father.

As a writer, Lenngren frequently used satire, sarcasm, and irony, and she often made parodied the genre of pastoral, opera and ballad.

[1] Her verse was often short, portraying everyday life, almost always in a city environment, and she criticized artificiality and lack of genuine value behind the facade.

[3] Her successful early career during the 1770s was influenced by her feminist ideas, foremost her defense of women's right to participate and engage in intellectual work.

[1] Anna Maria Lenngren was a supporter of the realistic and scientific views of the age on enlightenment and disliked religion, sometimes interpreted as a protest against the religious environment of her childhood home.

[6] Her best-known poems on the class system are Hans nåds morgonsömn ("Morning prayer of His Grace") and Grevinnans besök ("Visit from the Countess"), in which she satirizes snobbery, and Pojkarne ("Boys"), in which she laments the fact that children of all classes can play with each other during their childhood, but that this solidarity and friendship is destroyed when they became adults, along with the popular Det blev ingen julgröt men ändå en glad julafton ("There was no oatmeal but still a happy Christmas"), in which she describes the effects of poverty.

[1] Anna Maria Lenngren is portrayed in the novel Pottungen ("Chamber-pot child") by Anna Laestadius Larsson from 2014, where she, alongside Ulrika Pasch, Ulrika Widström, Jeanna von Lantingshausen, Marianne Ehrenström and Sophie von Fersen, becomes a member in a Blue Stockings Society organized by the Queen of Sweden and Norway, Hedvig Elisabeth Charlotte of Holstein-Gottorp.