if you flying an ILS and your inverted and the Glideslope needle is
one dot low, do you push or pull?

Regardless of attitute, you are ABOVE glide-slope and you need to lose altitude.

An inverted aircraft would "pitch up" to "go down."

PULL.

You could also pull the power back a bit, and keep the yoke right where it is. 

Of course, another good maneuver would be to place your head between
your legs and kiss your butt good-bye!

weisstho-ga, CFI-AIM

If you reduce power, you might need to push the stick forward
slightly.  But don't get caught behind the power curve, since it might
be hard to recover from a low altitude stall in the blind while
inverted.

It would also be wise to be well briefed on the missed approach
procedure, since you are unlikely to break out in a position from
which a normal landing can be completed at any time, and you will need
to execute the missed approach.  Especially if you go to DH, which is
typically 200 AGL on an ILS.

What I wonder is, should you add a notch of flaps?

Of course if you could see the terminating lights, you could go down to 100' . . . 

And, of course, if you add a notch of flaps you would get a little
lift and get down to the glide path even quicker!!

A notch of flaps - you crack me up!