Place fresh food and water where she can smell/see it then leave her
quietly alone.  She probably will come out to eat when no one is
around to frighten her.  This may take a few days.  It might be a good
idea to leave a litter pan close by also (not next to the food).  She
will need an adjustment period so don't try to rush it.  Good luck.
MLB

Do you have one room - such as a little-used bedroom or dining room, etc.,
where you could put her for a while?  Putting her food, water, & litter box
in the room, along w/ a cushion or two for comfiness - if no bed or
upholstered chair is in the room.  That might make her less frightened/more
comfortable.  You can then go in w/ her at various times & just sit
quietly - reading or whatever, along w/ occasionally talking to her, till
she shows signs of getting used to your presence, if you also feel that
she's uncomfortable as far as people go right now.

Cathy

--
"Staccato signals of constant information..."
("The Boy in the Bubble")  Paul Simon