its doable. Not enjoyable.

You go to "war" with the army you have not the army you want. if you want to get a new founder on board then start looking but I wouldnt delay today because of it.

If you are having second doubts. Then reevaluate. Ask why she left and get More feedback from others.

People will start joining when you least need them ( when you start becoming successful ). So I'd advance only if this is your vision for your contribution to this world.