If the she still fits in the infant seat length- and weight-wise, you could just leave it snapped into the base and put the baby in and out of it as if it were a convertible seat. That could give you time before you have to buy one or both convertible seats.
Good point on the lighter carseat...luckily we have a Safety 1st seat that I'm not totally in love with in DH's car, but it is light enough for a plane. I ended up buying a Marathon last night for either my car or vgirl's and took my MIL up on her offer to buy another one. She's really good at doing the research, so I'm letting her choose.
So we have 3 carseats down! Now my mom just needs to get one, but luckily she is buying one for herself

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