Wealthfront for home sell money for assisted living for relative?

Hello all mother just went into assisted living and selling her house to be able to pay for it. Expected to take away about 400k and am seeking a safe institution to park it. AI search identified wealthfront as the best. Need a no risk savings account with no penalties to take money out. Also need fdic insured for the entire amount. Any thoughts on this as a viable option? Thanks in advance