131. Śāntimatī
This word has two meanings,
that She has peace within Her and
that She has a peaceful mind.
Śānti means peace and mati means mind, more aptly discrimination. Quiet, discrimination, balance, and harmony are some of the most important characteristics of the Mother.
Source: Śrī Amṛtānandanātha Sarasvatī "Sudhā Syandinī Bhāṣyaṃ" Typed Manuscript
(an incomplete commentary on Lalitā Sahasranāma)