You were close too Yasemin, so you can have some too..

Mavili , dont worry,,I have got enough baklava for you all .. here yours comes :

Yaşasınnn!!! Sağol Hocam!!

A bit explanation;

" I wonder whether[if] she came to the party "

"Onun partiye gelip gelmediğini merak ediyorum."

O [she] + n [bufferin n] + un [genitive]    parti [party] + y [buffering y] + e [dative case] gel [come] + ip [gerund]    gel [come] + me [negative] + dik [nominalization,"k" changes into "ğ"] + i [possesive for 3th person] + n [buffering n] + i [accusative]   merak [wonder] + et [aux, "t" changes into "d" ] + iyor [progressive tense] + um [person "I" ]

çok sağol Tunci  I am having to mostly concentrate on vital class work lately (and its probably going to be that way for the next couple of months) but I am still reading and listening to and practicing Turkish every chance I get. Of course doing it that way does not promote remembering it too well but better than nothing!

 Rica ederim Mavili...Evet, anything is better than nothing. One day you will get there..As Mandino said " Failure will never overtake you if your determination to succeed is strong enough". 

This is gonna be a pain  ;

" I know a store where she will be able to find the skirt that she´s been looking for a long time. "

Kolay gelsin

Here goes my guess:

uzun zamandır aradığı eteğin bulabildiği bir dukkanı biliyorum.

uzun zamandır bulabilecek aradığı eteğini  bir dukkan biliyorum

bulabilecek uzun zamandır aradığı eteğini  bir dukkan biliyorum

 Good try Hindistan, but you need "future tense" somewhere in the sentence.

Denemeye devam. !

 Your try is good too..carry on trying !! Denemeye devam Elena !