In answer to your question, she's doing very well developmentally.  In some ways, she is like a 7 month old (her true age) and in other ways, she is just a 4 month old (adjusted age).  Like your boy, she loves to "stand" and jump, and has great head control and strong legs.  Just in the last month, she did start reaching for things.  Like you, I was getting worried because her doctors would ask at every appt, and just at last month's appt, I said no, not reaching yet.  Then one day, out of the blue, she started reaching.  I really don't have any tips to offer, I think they just do it in their own time.  Mine is teething too and can't handle the regular sized teething rings.  So I give her a toy that is a hard teething ring about the size of a bracelet.  I'm not sure who gave it to us or where they found it.  I think it came with several other rings attached to it, and it took me awhile to realize that the whole assembly was too heavy for her, but when I detached the other rings, the one was just the right size for her.

Hope things continue to go well for you!