First, we highly recommend that you talk to a La Leche League International Leader when you have a specific question about breastfeeding. These leaders are highly qualified to address the issues raised in this question. A one-year-old obviously still needs to nurse, but there could be many issues at work (for example, starting solids, teething, food allergies, or high-need temperament), which the leader is trained to explore with you.
As far as Attachment Parenting goes, we suggest looking at the attachment needs of the baby. Has something happened in the baby's life that might cause her to want to nurse more frequently? Something like moving to a new home can be emotionally unsettling for a baby, even though she is loved, held, and nurtured. A new environment takes quite a bit of adjustment, and a baby wants the comfort and security of nursing. After you've explored every angle and it seems your baby is physically and emotionally healthy, you might find ways to decrease the frequency of nursing by actively engaging the baby in play or getting your partner or other trusted loved one to take a more active role in occupying her.
Some parents worry about setting up an unhealthy habit, but you will find that your baby will naturally decrease her nursing over time, especially when she is taking in more solid food and becoming more interested in the world around her.