There were many of these small spiders scurrying through the moist grass in a receding vernal pool. This one appeared to be carrying a large round egg sac. She was not able to jump out of a 1 inch tall plastic cup. She was released after photos.

POSSIBLY Pardosa tuoba, a member of Wolf Spiders (Lycosidae) family.

Link to confirmed observation of Pardosa tuoba nearby: https://www.inaturalist.org/observations/1736440

Field Guide to Spiders of California and the Pacific Coast States, RJ Adams and Tim Manolis, 2014, pp. 224-225, plate 46.

Bug photographs from the U.S/Canada for I.D: https://bugguide.net/index.php?q=search&keys=Pardosa%20tuoba

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Thin-legged Wolf Spiders (Genus Pardosa) "There are 40 species of Pardosa from Southern California to northern Washington. They show considerable variation in color and pattern, from pale gray and brown to nearly black and from uniformly colored to boldly patterned. Papadosa are small wolf spiders with long, thin legs, and when seen head on, the anterior sides of their carapaces are straight and nearly vertical, not sloped, or bowed, like those of other, similar genre.”
Field Guide to Spiders of California and the Pacific Coast States, RJ Adams and Tim Manolis, 2014, pp. 224-225., plate 46.

Thin-legged Wolf Spiders (Genus Pardosa) "Pardosa is a large genus of wolf spiders, commonly known as the thin-legged wolf spiders. There are more than 500 described species that are found in all regions of the world. They are small to medium size wolf spiders, with clear and median and lateral bands on the carapace. They have relatively long legs with long spines on the foot." https://www.inaturalist.org/taxa/47415-Pardosa

Spiders in Your Neighborhood: A Field Guide, Revised and Expanded Paperback, 2022, Patrick Stadille, Wolf Spider, p. 35

Spider eye arrangement article from Lynette Elliott:
https://bugguide.net/node/view/84423

Bug photographs from the U.S/Canada for I.D: https://bugguide.net/index.php?q=search&keys=Pardosa and https://bugguide.net