Rubrum lily dying
My mother recently received a Rubrum Lily for her birthday. After it had finished blooming (around a week ago, maybe a little less), she planted it in one of her gardens. Today, when I got home from work, I noticed that it is doing horribly. This garden has a few different varieties of lilies that are all doing wonderfully. There is shredded red mulch on top of the soil as well. The first picture (attached to this post- sorry for bad quality) shows the lily, which has three stems. Two of the stems are brown/green with no leaves, the third stem is still green with yellowing leaves. The second picture (I will post again after this, and attached this second picture to that post) shows the leaves that were on the ground. I felt the way the leaves seem to have browned from the inside out was odd and may be a clue to what is happening. The leaves were not stiff and crumbly, I'm not sure if they fell off themselves or if my mom had pulled them off.
ANY help would be wonderful!