You’re best bet for vegetarian-friendly Chinese within an easy 15 minute (give or take) drive from City of Hope is Tasty Noodle House on Main St in Alhambra.
Go south on Fair Oaks, left (or east) on Huntington Drive), then a right (or south) on Atlantic and then a left (or east) on Main St., then it’s immediately to your left.
Tofu dumplings, mushroom egg dumplings, Shanghai rice cakes, and the leek pancakes are all solid vegetarian options.
Although if you go I think you owe to yourself and to @chandavkl to order the chicken corn dumplings. Just because they’re chicken and they’re dumplings and they’re served in a real Chinese restaurant.