Will my clownfish be okay alone

[LxHowler]

I had a pair of bonded de vinci clownfish. Sadly my male has passed away and now the female is the only fish in the tank. I do not really plan on buying another fish for the tank but wanted to know if she will be okay on her own in the tank. Its a 30 gallon cube and the clown is the only fish in it. I am currently trying to work out what has caused the fish to die

 

[Spare time]

The clown is fine alone