In 2017, Howells' poem 'Airlings' won the Welsh Poetry Competition. This win was followed by another prize the next year, when 'The Winter-King' took first place in The Rialto's Nature & Place Poetry Competition. Both of these poems would eventually appear in Howells' first full collection The Language of Bees, published by Parthian Books in April 2022. In May 2023, The Language of Bees was shortlisted for the Wales Book of the Year award, with the shortlisting announced on BBC Radio Wales.
Howells' second poetry collection, This Common Uncommon, was published by Parthian Books in May 2024. It centers on West Cross Common, a threatened peat-based green space in Swansea. Discovered by Howells and her family during the COVID-19 lockdowns, this biodiverse but neglected area was facing potential housing development. Written to support the—ultimately successful—campaign to save the land, the poems personify the common to give voice to its flora and fauna. Ultimately, the work explores environmental conservation and human connection to nature, serving as both a celebration of a unique habitat and an urgent call to protect vital green spaces.
Howells also regularly works in collaboration with other writers and artists. Before her first full collection, she published Bloom & Bones: a collaborative poetry pamphlet with fellow Swansea poet Jean James. Presented as a 'poetry conversation through colour' and inspired by The Secret Lives of Colour by Kassia St Clair, the pamphlet contained twenty poems responding to ten colours: white, yellow, orange, pink, red, purple, blue, green, brown and black. Hedgehog Press published the pamphlet, and it launched at The Swansea Fringe festival on 24 October 2021. Later that year, Howells was selected as one of five Welsh women artists to take part in Ù Ơ: a virtual artistic residency linking artists from Wales and Vietnam.