You do know it is not a grandchild if she bears it right? Then it would be just a child for her. If she really wants another grandchild maybe she needs to take a needle and just ram it into sterling archer balls and inject it into a woman. Then she would have a grandchild.
Other then that it is a nice drawing ... she could use more rimples because she is ... like you know old (not touching that topic of how old) so yea 4,5 would have been 5 if she just wanted a child and not grandchild.