16 Year old summer job

Good Morning.   This is not related to itemized deductions, but I hope to is ok to ask this question.

My 16 year old will be working a summer job for 3 weeks, possibly 4, making $440 each week.  When checking with Turbo Tax last year with the same question, I was told she would not owe Virginia Tax because she would be under the income and could mark Exempt on the Virginia Form VA-4, but that if she might make over $11,950 it would be best to claim 1.  We marked exempt last year because she would not be making over $11,950 for the year.  Would this still be the same situation for this year?  It is possible that she will get a part time job in the fall, but don't think she will make over $11,950.  If she does get a part time job, will it be best to claim 1 or 0 when she fills out the VA-4 for the new part time job possibly obtained in the fall?  Would starting a part time job in the fall affect how we should fill out the VA-4 form for the summer job (exempt, 0, or 1) even though we are not sure if she will have a part time job in the fall yet or not?  Additionally, am I correct that she will just fill out the W-4 as single, and make no other entries, and sign the bottom.

Thank you.  I hope this makes sense.