I haven't seen your other post, but have you tried lots of skin on skin time with you and your baby? Just relaxing and trying to keep things low-key for both of you? In the bath or snuggled up in bed....maybe with low lighting. A really calm time for you to be close and to see if she latches on in her own time?
it may well be-its harder to suckle than just swallow mush when noses are blocked and i find liquids are harder to swallow than solids when i have a bad throat
have you tried those drops for blocked noses?
that said my 3rd all but stopped by 10months<token suck at bedtime> each of my 4 chose when to stop<18mnths,14months,barely 12months,13months> so they no when theyve had enough of me.i can understand the last baby suckling though-my youngest is now 5 and i still miss it<and for some reason one of my breasts still hasnt completely accepted it either and a drop comes out now and then!>
i hope you get some extra snuggles and suckles for a bit longer and hoard those lovely feelings and memories of it all to reminisce over fondly!
I've just written about the very same thing... http://mummyisagadgetgeek.co.uk/?p=1647 except Bubby D is a bit older than your little one.
It seems quite likely that her cold might have something to do with it - have you thought about trying different feeding positions (more upright ones perhaps) so that she can breathe more easily?
I'd also agree with live - feeding before giving food might be the best option - at 7 months babies only need about 200 calories on top of breastmilk and that equates to two bananas! So not much when you think about it really
Good luck and I hope your little one is feeling better soon x