Tenant vacated unit without proper notice (California)

[Ricardo P.]

An inherited Tenant of mine failed to give me a written 30day notice to vacate the property. She was a tenant who was on a month to month lease agreement. She turned over her keys on March 5. On top of that She is requesting a full refund of her security deposit or else she would take legal action. 

1. Ive already followed California state law that requires me to send her a full itemized letter before the 21st day is due. I sent it to her through certified mail+ signature was required. I have my copy just Incase. I did not charge her for any cleaning fees,repairs ect. 

2. I’m keeping her deposit to cover rent for March(deposit isn’t enough to cover this months rent) + 4 days for April. 

30 days in all. 

To make my understanding short she actually owes me money. $950 to be exact.

Is there anything I’m missing before she takes me to small claims court? 

I’ll be filing a counterclaim against her for the rest of the money owed to me if she wants to take it that far. 

[Ricardo P.]

@Hubert Kim I spoke to an eviction attorney lastnight before bed. He told me since there was NO text,email, letter the 30days start the day they turn over keys. She turned over the keys on the 5th. Rent is due on the first of each month. I sent over my itemized letter before the 21st day. So I should be good. I hope