The tomb verses take place in the next chapter before sunrise of the first day of the week, Sunday. Some 24-36 hours later.
In this verse it doesn't say James the less, though I suppose we 'could' assume that this is what is meant, however, why not mention that this Mary is the mother of the Lord and why didn't the writer see fit to mention, Joses, Simon or Judas?
I'm not real sure that it really matters if she were at the tomb or not. Would it change anything, if she were or was not?