I'm sure  many people will respond it this situation,  Cathy

>She has a 7 week old baby and just returned to work last Monday.  She is not
able
>to pump enough for the baby while she is gone, so she took a vacation
>day to build up her supply.

When I get calls from mothers experiencing this type of problem I find I use
a lot of empathic listening while I try to reassure her and inform her.   I
start out telling her that since she has been home with her infant for seven
weeks, she and her child are probably quite in tune with each other and that
her body is well-conditioned to letting down for her baby and much better
than for the pump. Also, the fact that now she is putting herself 'on the
spot' in a major way and demanding a certain stellar 'performance' from
herself  is enough  stress to inhibit a let-down -  that she is probably
feeling panicked and that there are ways to augment her pumping when is is
calm.  I would tell her that many mothers might get one half to an ounce at a
half at a pumping session normally even though some mothers may have more and
remind her of the size of her infant's stomach and that some breastfeedings
they've had might just have been  of an ounce or two of milk.   I would ask
her questions about her prior pumping experience, volume, etc. and ask if she
has used any techniques to increase her ability to respond to the pump:
 Chele's tecniques of maasaging the breast, and leaning over and shaking them
before pumping; trying to condition herself to letting down by humming a song
to her child and humming the same song while pumping; having a piece of the
child's clothes to smell while pumping as well as a picture of the baby there
to look at.

. We would also talk about pumping while with the baby on the opposite side
while nursing to take advantage of the let-down created by the baby.

And at some point I'd talk about the fact that different mothers produce
different amounts of milk at pumping sessions - that she shouldn't compare
her 'output' to anothers,  that we all strive to give our babies the best.
 I'd feel her out about the mixed emotions of leaving her baby and try to see
how strongly she feels about only having the "liquid gold" mother's milk
given to her baby.  Thae fact that if she is doing her best to pump for her
baby, that she may have to grieve about the fact that she might not be able
to produce enough milk while away from her child to have while in daycare.
 Also that mothers in her position find that they build back their supply on
weekends when they  let the baby nurse as much as the baby wants all weekend
long.   That many of the immunological benefits of breastfeeding will still
be much higher for her baby if she supplements than if she were to wean
altogether, and that continuing to nurse will continue the strong bond she
has built with her baby. That coming home from work will be a time of renewal
in their breastfeeding relationship that they both will look forward to.

Of course, not all of this necessarily.  Just what is needed according to how
the conversation goes and how she feels about each thing.
Mardrey Swenson, LLLL, DC, IBCLC